I just googled it to get the pictures.  But I think, the best way is to drive around the taman taman, and see which designs u like, snap a picture and ask the contractor to do it.

Mild steel gate is the cheapest, but can rust and hve to repaint to keep it good.

Wrought iron gates, must have hot dipped galvanised which is a process to coat the mild steel with a rust-proof material.  After hotdip galvanise the metal must be powder coated to give a nice texture and color.

Stainless steel is the most expensive.  But the steel can be very glaring under the hot sun.  Stainless steel is generally maintenance free, but I think the looks are so so only.  So far, I have not seen a nice s/s gate.

Galvanising is the process of coating a thin layer of zinc onto the mild steel members. Hot-dipped galvanising is the done by dipping the completed mild steel members (in this case, the gate) into a molten bath of zinc at very high temperature.

As for the price, it will be slightly more than those non-galvanised. This is due to the galvanising cost and also the increase in the thickness of the members to be galvanised. There is a minimum thickness of the mild steel member for galvanising. If the member are too thin, it could warp during the hot-dip galvanising process.

If you are concern with rust, then hot-dip galvanising is the way to go. My gate is galvanised.

according to google translator   

镀锌

You can ask your gate fabricator..

BTW, if you are galvanising the gate, you need to apply the following surface protection system. Else, there will not be proper adhesion between the paint and the galvanised surface. After sometime the paint will start peeling off. 

1. Hot dip galvanising
2. Etching primer - can get from most hardware shops
3. Finish coat - can be Micaceous Iron Oxide or the normal Nippon/ Jotun paint
Many of the workshop (I meant those the make the gate & grille) does not know this. This what what I come across when I was try to do up my front gate. They just apply the normal red oxide and the finishing coat. Few months/ years later, the paint starts coming off. 
However, the galvanising remains if properly done.

Depend on your gate fabricator. I bought the etching primer and MIO; and pass them to my fabricator to use. He applied them using his spray equipment. The finishing is much better than painting with a brush.

The etching primer is important for galvanised surface. If you apply the normal red oxide, it will not bond properly with the galvanised surface. The primer is the first coat after the galvanised surface. Thus, it is the most important coat. If the bond is not good, after some time, the paint will start peeling off. So, whatever paint that is painted on top of the primer will be of no use.

If I recall correctly, the etching primer that I used was Olive Green in colour.

As for the MIO, they comes in either grey, black and another lighter colour which I cannot recall.  I used MIO for its durability as well as for its texture (like the surface of fine grade sand paper)
Alternatively, you could use the normal Acrylic finishing paint.

this is what I used Nippon Etching Primer 120

http://www.nipponpaint.com.my/professional...=14&rangeID=114

Cost me RM90 for 5 lit tong

does the swing arm type auto gate has a lock/pin (which is contained in a iron box) in the centre to lock the auto gate?

if no, isnt it possible to pull the gate open forcefully from outside since there's no lock mechanism/barrier in the centre?

sorry for the basic question. still new to swing arm type system.

PS: am using the ground embedded system with a central lock.

ok thanks for the info. very helpful.

what about the system like DCMOTO? i thought they're using gears as well to open/close the gate. is there a lock mechanism for such system?

do you know what's the difference between 903 & 905? cant seem to find much info about 903.

this mean the 903 is using the typical remote control that can be duplicated?