Why do you need impact when screwing in?

Just to share my new toy Bosch GDR10.8.
just to share reference size between 226(nearly same size as 2470) and small impact driver 

Thanks for the suggestion. That is 'self tapping screw', which creates screw thread when we driving it into a pre-drilled hole. THe drilled hole should be a bit smaller than the screw size. Normally a thread maker tool needed to make the thread, but this self tapping screw can be used without using that thool.

I hope I can find few of it in hardware shop. I don't have steel bars, but, I think it can use is to attach something to somthing in future.
Thank you.

yeah mine is gdr10.8 mk2 and its made in malaysia. only come with one batt tho but i think is sufficient for diy users. now i am looking for their driver heads. anyone try kennedy brand before here???

Can we use an impact driver for drilling?
I think I saw a special drill kit for use on an impact driver.
Anyone try it?

Brought this set 2year ago for rm290. Model gsr10.8v-liq bosch. Use for screw and drilling till 4mm dia. Bigger drill no torque. It have torque adjustable 1-10 (probably max 10kgf/cm) which good for screw. It come with a torchlight which you can use the drill battery.

Yeah. Like that.
I assume you will be using normal drill bits?

What happens when the impact mechanism kicks in while drilling?
Also will the drill bit hold steady when spinning or will it "wave" about (like the screw bit in bahathir's rotary hammer video above)?

Agreed. Impact driver's impact mechanism  gives extra TWIST or torque to spin the bit. Remeber, impact driver torque is much bigger than normal drill driver, and the the chuck's jaw cannot grip the cylindrical shaft's bit. Sometime, this extra torque impulses also can loosen the chuck's too, especially in reverse mode. So sometime, better get separate  specialize tools for greater result. I know, as a DIYs, we have a limited budget, so, getting a good tools which last longer is very important.

In my case, masonry/concrete drilling is a very tough to the tool. You may get 3 in 1, or 4 in 1 cordless impact hammer drill driver, but, really, how much you achive with this tool? the 4 in 1 cordless tool, exmample BTP140,  is very rare in Malaysia, and it may cost you MYR2000 or more. Hey, I bought  Makita HR2810 rotary hammer + Makita TD010F impact driver + Makita GA4030 angular grinder, and it still cost HALF of the Makita BTP140! Yeah, sometime conveniences cost more than performance. Yeah, different people, different needs, so up to you to decide which tools are sutable for your need.

Thank you.