Irwin Blue Groove stubby auger bits.

[John Brown]

I needed to drill a 16mm hole for a rack bolt, so I splashed out on a set of 3 Irwin Blue Groove bits(I have a irrational dislike of spade bits). I think this set is one of the specials that seem to appear in local hardware stores in time for Christmas, but at £9.99 I am impressed so far.

 

[Trevanion]

I've got a set, they absolutely fly through CLS! They're excellent at drilling plastic as well. They're a bit too rough for what I do though, I actually prefer the flat bits for cleaner and more controllable drilling.