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 the nut for defects and damage before using it to avoid causing safety accidents. Diameter 49mm, height 13mm, weight 114g.