A
Adam W
Are you thinking of an impact wrench?Never realy had the need for an impact driver as an electrician.
Used them when doing vehicle repair and maintenance, and when working as a maintence engineer in a factory.
The type I have though, is one you thump with a hammer and is made by SnapOn.
Square shaped with rounded corners and I believe 32mm across, so a spanner can be used for added torque.
An impact driver is basically a cordless screwdriver which starts 'hammering' in the screw once it bites, which saves your wrists and offers much higher screwdriving power than an equivalent sized drill.
As an electrician I find mine is useful for putting up trunking, taking down trunking, screwing backboxes to walls, screwing down floorboards, unscrewing floorboards, fixing conduit saddles, screwing battens to walls, fixing noggins between joists, screwing wall lights to walls and ceiling lights to ceilings, and basically anything that involves screwdriving.
My 10.8v fits in my pocket as well, which is handy when working at height or when I need my tools to hand.
(Not actual size)