Quick clamping nut: Quick clamping nut with M14 thread for fastening and quick release of diamond discs, cup-shaped grinding wheels. Abrasive disc and other accessories. Non-slip design: The bottom has a fine frosted texture so that the nut locks the grinding disc without slipping. Please wipe off the disc, spindle and quick-release nut before using to avoid getting stuck by foreign objects. Material: Made of high strength alloy, working without deformation, can withstand 40N torque and 12,000rpm. High speed, longer life. Compatibility: Compatible with all M14 angle grinders on the market; suitable for diamond cutting discs, abrasive discs, cup wheels, diamond grinding discs and most other types of grinding discs. Attention: Please check for defects and damage on nut before using it to avoid causing safety accidents. Diameter 49mm, height 13mm, weight 114g. Delivery quantity: 1 pieces