General description Dual-drive spline impact bit set with adaptor and locking coupler offering the option of 1/2" and 3/8" drives. The bits feature a 17mm Hex (6pt) head, allowing the use of a spanner or ratchet wrench in restricted spaces. This professional set is presented in an EVA foam storage tray for convenient tool drawer storage. Technical specifications Material: Chrome molybdenum Finish: Anti-corrosion black phosphate Sizes: M6, M8, M10, M12, M14, M16, M18 Tray dimensions: 180mm x 130mm Compatibility and accessories 3/8" D / 17mm to 3/8" D impact adaptor 1/2" D locking coupler