3. Mandrel heat treatment, high hardness 2. The screw can adjust the front and rear distance of the Drive pillar to increase the grip strength of the Drive. 1. and durable, strong bite force, not easy to deform. 4. Good tenacity, not easy to deform with held objects. 5. Used to fasten workpieces such as welding, riveting and grinding. Fastening parts for welding, riveting, grinding, etc., Weight: 1.72181026622 pounds, Manufacturer: Rtxbvg