9pc Hex Key Socket Bit Set3/8" Square Drive 4mm to 12mmPREMIUM S2 SteelProfessional heat treated Chrome Vanadium steel sockets. Fully polished black chrome finish with machined and lacquered surfaces. Steel hex bits with a phosphate finish. Knurled rings for extra grip with oily fingers. Supplied on socket railFeatures: Professional heat treated Chrome Vanadium steel sockets. Fully polished black chrome finish with machined and lacquered surfaces. Steel hex bits with a phosphate finish. Knurled ring for extra grip with oily fingers. Contents: 4, 5, 6, 7, 8, 9, 10, 11, 12mm. Supplied on socket rail. Lifetime guarantee . Specification: Contents -3/8"Sq Drive 45mm Hex Key Socket Bits; 4, 5, 6, 7, 8, 9, 10, 11, 12mm Drive -3/8" Net Weight -0.415kg Further Information We sell a wide variety of tools and workshop equipment for both the DIY and Professional markets. Alias: ys01861 Loops 9pc Hex Key Socket Bit Set - 3/8" Square Drive 4mm to 12mm - PREMIUM S2 Steel in Metallics