The Draper 33 Piece Security Bit Set contains a magnetic bit holder, three torq bits of size 6, 8 and 10, four spanner bits of No. 4, 6, 8 and 10, four tri-winged bits of No.1, 2, 3 and 4, six metric hexagonal security bits of size 2, 2.5, 3, 4, 5 and 6mm, six imperial hexagonal security bits of 5/64, 3/32, 7/64, 1/8, 9/64 and 5/32inches and nine TX-STAR security of sizes T8T, T10T, T15T, T20T, T25T, T27T, T30T, T35T and T40T. The bits are manufactured from chrome vanadium steel, hardened and tempered with a shot-blast finish. The bit holder is manufactured from zinc alloy steel with a chrome-plated finish. Supplied in a storage case.