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Expert Quality, Draper TX-STAR® 8mm bits manufactured from silicon steel hardened and tempered with shot blast finish. 3/8" Sq. Dr. bit holder made from chrome vanadium steel hardened, tempered and chrome plated for corrosion protection. Contents 1 x Bit holder: 8mm x 3/8" sq. drive 6 x Draper TX-STAR® bits: T20, T25, T30, T40, T45, T50