High-speed Steel Thread Spiral ScrewThis High speed Steel Thread Spiral Screw is ideal for auto repair and machinery where metric threads are specified. It is suitable for soft tapping metal, aluminum, iron, etc. The screws are multi coated to remain bright and sharp. They come in various sizes, each fitted for repairing materials of different proportions.: Color: Silver Materials: High speed steel (HSS) Shank Diameter: (6. 35 mm) hex Sizes: M3 x 0. 5 (6 32NC) total length: 55 mm;