Draper Metric Hex. Socket Bit Set, 1/2" Square Drive, 55mm (9Pc) -Expert Quality, 9 socket fitted with hex insert bits. All socket manufactured from hardened and tempered chrome vanadium steel with sand blasted bits of S2 silicon steel. Each socket has a knurled ring for extra grip. Supplied on a steel socket retaining rail. Key Features Expert Quality: This Draper Metric Hex Socket Bit Set features 9 high performance sockets fitted with durable hex insert bits, ensuring reliability for professional and DIY tasks.