Purpose HEX set of bits in a holder designed for mounting and dismounting type fasteners Slot: H4, H5, H6, H7, H8, H10, H12, H14, H17. This set of replacement bits is suitable for use with the ratchet handle and the holders with the mounting square 1/2 ". All heads have special notches that improve adhesion with a gloved hand or with a hand grease soiled. Material Bits are made of hardened steel topovoy , the highest mark S2 quality. In the composition of the steel contains molybdenum and silicon, which gives the product a high resistance to loads and low threshold reversible deformation. Sami head made from durable Cr-V steel, such combination makes the nozzle reliable, robust tools with a large inventory .. All work Keyes set is placed in a durable plastic case with metal clasps, stylish design STORM series of metal locks will save the case of accidental opening box is easy to carry and store, it is compact and does not occupy much space in the heads of Options bits 1/2 "..: H4, H5, H6, H7, H8, H10, H12, H14, H17.