These quick change drill adapter will drill the hole for the body of the screw, counter bore for a plug. Use our self centering drill guides for accurate drilling of holes for hinges, handles, draw guides, etc. Standard hex shank fits all power bit quick change chucks. Set includes 5/64", 7/64" & 9/64" guides that will accommodate 2 thru 10 screws. You will get accurately centered holes using these guides with their high speed steel drill bit. Simplifies mounting hardware - switch from drill guide to screw driver instantly. Made in USA by Snappy.