S136 Screwdriver Bits Socket Extension Socket Extension bits give you the ability to attach sockets to a power drill, allowing the fixing of nuts or hex screws that are too large for Nutsetters. Pin lock for secure attachment of socket Magnetic tip increases productivity and eliminates frustration when working at awkward angles or in tight spaces 1/4" hex shank with power groove for use in power tools and quick change adapters Tough grade high-alloy Chrome Vanadium steel absorbs shock and offers superior performance