Hi Guys,

Need some advise, I wanted to drill some mount for curtain rail, TV cabinet etc.
So I invested a cordless Bosch drill with hammer function.

On my 3rd room I drill for 1 hole used over 1hr - 2hr. It's ccrazy, then I curi Ayam by not drilling too deep for other hole (need 3 bracket, 1 full depth, another 2 I cut off nail and the plug to half).

Each time I drill, its smooth for 1.5cm around 0.6inch then it become damn hard , I think it's concrete, and 1.5cm it's cement?
I am using mansory drill bits and I try switching a few with my uncle itss still give similar result.
I also borrowed my uncle corded hammer drill, black decker hit 1.5cm then become very hard to drill like not moving..

Aircond installer come they also complaining my wall is very hard to drill which they use a lot force, they said normally few min 1 hole they did, my hse like near half n hr for 1 hole.

Need some advise as below.
1. If I just drill 1.5cm and cut plug with screw, will it dangerous? cause I not sure how much weight it can take.
2. If I shall drill full 3cm (normal screw n plug length) any tips to proceed the hard rendered concrete I assume? not sure is my drill bit problem or drill or skill.. haha

Edit =high rise condo

This post has been edited by eddie2020: Jan 21 2022, 03:19 PM

chuck away d bosch drill bro

same situation. switched to china cheap drill, 30sec per hole!!!!

did reno whole house, 1 china cheaplug diy drill 9dim

rm 200+ nia

EDITED = CHEAP CHINA HAMMER DRILL!

This post has been edited by MISMan: Jan 20 2022, 04:17 PM

Dei. Wrong drill la... You should get a corded one for walls. The wireless version that will work on concrete walls cost thousands!

Ya cordless no power

apa brand and specc..
but I used decker corded also same.. You full speed n force ka?
Bro Ada pakai corded also my uncle one... brand is black decker.. Speed more fast but do we need so high speed?

Used both if u read whole thread

YOu need an impact SDS drill..

What drill bit did you use? There are generally 3 types of bits
for wood
for metal
for concrete

If the drill does not use SDS+ drill bits suffice to say it is useless for concrete drilling. You are using the wrong tool for the job.

the SDS bits look like these (slotted)

Those so called impact drills take forever to make a hole in concrete. Its power = the toy plastic hammer used by kids, hammering at 40000 times a minute.
Even B&D corded also.. a lot of neighbours in my apartment will try.. then give up.. they ask me come over to help them drill (for a fee lah)

What you need is a SDS plus ROTARY HAMMER. Holes in less than 10 seconds. The working principle: this is a mini Mike Tyson. No need to punch very fast, but every punch is powerful. Concrete need to be punched hard in order to break it up. It's not the same as peeling onions like metal.

Not expensive to get a rotary hammer - since the B&D orange drill already cost like RM150-160 which IMO is a total waste of money
RM180 gets you a Daewoo DARH-26SRE *full size 3kg
RM330 gets you a Bosch GBH2-20 *baby rotary but for light duty wall plug this is suitable coz its lighter for small job
RM345 gets you a Hikoki (Hitachi) DH24PH ROTARY HAMMER *full size 3kg

SDS Drill bits 5.5mm/6.0mm it can be as cheap as RM2 (see GH Hardware clearance for SKIL bits)
or RM5 for the better carbide ones (Makita/Bosch/Hitachi) or RM13 for atas carbide ones (Bosch 4-cutter) if you have extremely old/hard concrete.

The branded SDS bits last almost forever on one bit (80-100 holes per bit is common lifespan) because runtime per hole is in seconds. Not hours.
Save time save your arms and frustration and get a rotary hammer.

This post has been edited by ceo684: Jan 20 2022, 06:15 PM

GSR anything useless for wall because zero hammer

GSB 120/GSB 180 is screwdriver with small toy hammer for brickwork

GBH 180LI is the 18V cordless bosch rotary hammer.. this used to sell for 350-400 only for the tool.. nowadays closer to 500
Tool alone (was) not expensive - but need supporting battery and charger investment and that's the problem with cordless.


This post has been edited by ceo684: Jan 20 2022, 05:59 PM


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no brand 1 lah....

just go mr. diy n get it.

china 1 is so easy to drill. no need force at all. so powerful.

u can tell by the size of the drill, bigger, heavier than bosch.

get those >400watts

A rotary hammer is better, MrDIY stuff also not cheap nowadays.
This toy already 550W..


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Don't have sds
Mansory bits the silver thick one..
Haiya.. I am using gsb 120 around 300 bucks liao... Thought good enjf cz wanna drill bathroom as well... I wonder if I go buy better mansory drill bit OK or not like Irwin tools rm8 per bit.. Cause I go watch some yt also use cordless..



I think this same design of my uncle 1

u didnt mention ur place is landed or highrise

That GSB120 is good for non impact tile bits in bathroom
After u go thru tile, switch to rotary.
Anyway the GSB120 very good as a screwdriver lah.

YT overseas their wall either drywall plaster.board n wood, or bricks only.. concrete need the big rotohammer

Even using a 2J cordless rotohammer - there are times where it so happen the spot got a stone (can't trust the concrete mix to be pure 100% cement and sand, some mixed stones inside) also struggle a bit so need to bring out bigger rotohammer with 2.7J if you get the Daewoo this is big enough (3.2J) confirm all can wan.

This post has been edited by ceo684: Jan 21 2022, 02:01 AM

High rise...
Hahaha screw driver? Oh my...
What is the J reading? If get this 200buck Daewoo, can drill toilet tiles also? They got non vibrate mode etc and perform similar work like my current gsb rite

New property?

Many new highrise properties now use sheer wall as foundation support no longer using those big big beam anymore. Did u checked with management whether those are it?

Pretty sure something wrong if 1 hour also cant drill hole

Yes can but 3.1kg is quite heavy to hold for minutes..u will spend roughly typically 7 to 10 min per hole to use tile bits. I install many WH before. Hence, I recommend using the GSB120 for tiles. You won't get a difference for tile bits.

GSB 120 very light and u dont need speed for tile bits (slower better on gear 1 otherwise too fast the tile would blunt the bit). Trust me on the weight for drilling tile. Its a slow process. Need to let the tile bit core thru slowly, even the tile bit write there max 500 rpm.

The daewoo is perfect for concrete (after u bore thru the tile 7min, spend 5 secs with it)
Its cheaper compared to Bosch/Makita because internals (gearbox and motor) not as refined, so its heavier as a result.
Bosch/Makita stuff cost more for the refinement (vibration control, refined gearbox kinda things) - great if u use often but I guess for rare/occasional home use a Daewoo would be fine.

J joule reading is energy how powerful the rotohammer can punch.
2.0J if no stones OK. Got hard spot need to hantam a bit. Cordless bosch smallest model (GBH180LI) is 2J. It works well 99% of the time..except when kena stone.
2.7-3J got stone can still break thru.

GSB120 spec already maxing out 8mm masonry (bricks).
With concrete just kena one stone aka hard spot, confirm tak lepas with GSB toy hammer.

This post has been edited by ceo684: Jan 22 2022, 12:38 AM

I'm currently using GBH 2-24 DRE for drilling purpose. Sometimes when I start to drill using hammer mode, the area surrounding the drill point also come out abit, leaving some 10 sen size exposed mark instead of chun chun drill bit size hole.

I used to get clean drill holes using my previous hammer drill B&D and Stanley before upgrading to rotary hammer Bosch.

Is it normal this way using a rotary hammer drill or there's some technique I should learn or faulty drill?

If its lousy plaster work that's very normal. Even u use small pilot hole also doesn't eliminate this problem. If ur plasterwork is lousy, Can try without hammer first when starting off at plaster level and then rotary hammer the concrete.

Sheer wall?? Not sure, ya new property... Drill hole OK if hack or make hole big size like hood etc need ask management..

OK I buy daewoo then.. I sold my gsb.. Need drill tiles later neh.. Aiyo sell it too soon...