The BlueSpot 33 Piece Security Screwdriver Bit Set is manufactured from chrome vanadium for increased durability. Includes a handy carrying case for quick and convenient storage. Contains:4 x Flat Security Bits: 4, 6, 8 and 10mm.4 x Tri-Wing Bits: 1, 2, 3 and 4.3 x TORX Bits: TX6, TX8 and TX10.6 x Tamper-Proof Metric Hex Bits: 2, 2.5, 3, 4, 5 and 6mm.6 x Tamper-Proof Imperial Hex Bits: 5/64, 3/32, 7/64, 1/8, 9/64 and 5/32in.9 x Tamper-Proof TORX Bits: TTX8, TTX10, TTX15, TTX20, TTX25, TTX27, TTX30, TTX35 and TTX40.1 x 60mm Magnetic Bit Holder.