1. Durable and long service life. 2. High hardness and high temperature resistance. 3. Handle made of bearing steel. 4. Suitable for bicycle repair, assembling furniture, machinery manufacturing, etc. 5. Material: HSS 6542 6. Plating: titanium coating 7. Size: M2x0.4/M2.5x0.45/M3x0.5/M3.5x0.6/M4x0.7/M5x0.8/M6x1.0/M8x1.25