The 15-in-1 Tamperproof comes loaded with 7 double-ended SECURITY bits, each 2" long. The bits are stored securely within the screwdriver's handle and can be used with most power drills and cordless screwdrivers. Shaft opening is a standard 1/4 inch hex nut driver. A must for all commercial/industrial tradesmen (i.e. electricians, locksmiths). Security Star: #10, #15, #20, #25, #27, #30 Security Hex: 1/8", 9/64", 5/32", 3/16" Bi Pin: #6, #8, #10, #12

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