This security bit set is used to create a secure fastener assembly in unusual styles that are not found in the typical driver set The Draper 82397 is a 43 piece Security Screwdriver Bit Set that contains a range of different screwdriver bits. These bits are usually used with screws in security applications to prevent tampering as removing a security torx screw can be a hassle for those without the tool. The bits are chrome plated for greater durability and rust resistance. Features: 25mm 1/4\" bits manufactured from chrome vanadium steel, hardened and tempered with a shot blast finish Bit holder manufactured from zinc alloy steel with a chrome-plated finish Supplied in a heavy-duty plastic case with plastic inlay to hold bits securely Security bits are usually used to prevent tampering, such as in electrical applications. Removing a security torx screw can be a hassle for those without the tool Comes With: 1 x Magnetic bit holder 4 x Cross slot: No.0, No.1, No.2, No.3 6 x PZ type: No.0, No.1, No.2 (x 2), No.3 (x 2) 3 x Torq: 6, 8, 10 4 x Spanner: 4, 6, 8, 10 4 x Tri-wing: 1, 2, 3, 4mm 6 x Security hex: 2, 2.5, 3, 4, 5, 6mm 6 x Security hex: 5/32, 9/64, 1/8, 7/64, 3/32, 5/64 9 x Draper TX STAR security: T8T, T10T, T15T, T20T, T25T, T27T, T30T, T35T, T40T Specification: Pack Qty: 43 piece