Professional power bit / screwdriver bits for commercial or occasional use 50mm power bit screwdriver set Chrome vanadium bits for strength and durability Suitable for cordless screwdrivers and drills with variable speed Suitable for a number of purposes including repair and maintenance on electronic / electrical and mechanical equipment Can be used in ay drill (electric / air or battery) as well as screwdrivers with bit holder attachments Deep bits so perfect for access into restricted / hard to reach areas Phillips / flat (slotted and Pozi bits SET INCLUDES THE FOLLOWING - PHILLIPPS BITS - PH1 / PH2 and PH3 - POZI BITS - PZ1 / PZ2 and PZ3 - SLOTTED / FLAT BITS - SL4 / SL6 and SL8 - 1 x magnetic bit holder (suitable for use in all types of drills)