Professional tool for commercial or occasional use Quick release bit holder set Manufactured from chrome vanadium steel for strength and durability Suitable for all 1/4" drive hexagon bits Comes with quick change 1/4" shank Built in magnet to hold bits securely in place Quick release bit holder so to operate simply pull the sleeve back the head on the top of the item insert the hexagon bit and release the top for secure locking 2pc kit Total length of the bits 60mm and 150mm For use with quick release screwdrivers or the shank will also fit into any drill electric / air or battery with keyed or keyless chuck. Extra long bit for access into restricted areas.