CK T4528 8 Piece HEX Tamperproof/Security 1/4" Screwdriver Bits For Drills,2-7mm
Model: T4528. CK Professional 8 Piece Hex Shape Tamperproof/Security Screwdriver bits, with 1/4" Hex standard driver end. Being tamperproof/security bits,they have a hole in the centre of the hex shape.