24pc Precision Screwdriver Bit Set Bits are made of Cr-V, 28mm length It is packed in storage plastic case. 24pc Precision Screwdriver Bit SetBits are made of Cr-V steel, 28mm length.It is packed in storage plastic case, is used for call phone, glasses, computer, etc.Contains:22pc 28mm Precison Bits1pc Magnatic Extension Bar1pc Ratchet Precison Screwdriver 24pc Precision Screwdriver Bit Set