1/4", Impact Ready Detachable Nut Driver, Enhance The Overall Life A Nut Driver By Allowing Users To Detach The Nut Driver From The Shank To Clean Off Debris That Accumulates From Use, Robust Magnetism Provides Fastener Retention For Greater Ease Of Use In All Hex Head Fastening Applications, Universal Shank Accepts Detachable Nut Driver Sizes From 1/4" To 1/2", Engineered For Use In Impact Drivers.