33 security screw bits. These are for use with specialty security screws. Incl: electronics (laptops, phones video ), alarm system repair etc. You receive:9 Torx head security bits sizes: T8, T10, T15, T20, T25, T27,T30, T35, T40 6 Hex head security bits sizes: 5/64", 3/32", 7/64", 1/8", 9/64", 5/32" 6 Hex head security bits sizes: 2, 2.5, 3, 4, 5, 6 mm 3 Torq-Set head security bits sizes: 6, 8 and 10 mm 4 Spanner head security bits sizes: 4, 6, 8 and 10 mm 4 Tri-Wing head security bits sizes: 1, 2, 3 and 4 mm One hex head extension