The facom 83hjp9a set of 9 hexagon key which are easy to remove from and place in holder and with an immediate overview of all sizes the holder retains the lock on the wrenches offering minimal risk of loss the keys are ideal for driving bolts and screws that have hexagonal sockets they are made from silicon alloy providing strength and wear resistance the keys are precisely heat treated to ensure that if overloaded they will fail by twisting rather than breaking this guarantees user safety size