Specifications: M3, M4, M5, M6, M8, M10, M12 Material: high speed steel 6542/4341/4241/ bearing steel, suitable for soft metal, such as aluminum plate, iron plate. High speed steel 6542 All-steel design with chromium-plated finish for the highest durability. Beautifully precise ratcheting action for high quality work. Easily switched from left to right handed operation, or locked for non-ratcheting use.