This security bit set is made from chrome vanadium steel?CR-V?with a sandblasted finish to increase corrosion resistance. which is strengthful and durable. Contains ultimate bits (Phillips,Slotted flat,Square,Tri-wing,Pozi drive,Spanner,Torq,Torx star,Hex Head, Tamper proof Torx star), ratchet wrench,bits holder,quick bit relaease,extension bars, magnetic bit holders and other special bits in daily use. Each size is marked on the bits surface for easy identification. Includes multiples sizes to meet ur daily needs. Packed with a sturdy case with labeled slots to keep bits organized and easy to carry and storage. Includes magnetic extension drill holder and quick release. Can be used for electric screwdrivers, screwdrivers, hand drills and pneumatic tools. B0BMZWRBT9