Quick clamping nut: quick clamping nut with M14 thread for quick fastening and loosening of diamond blades, cup-shaped grinding wheels. Sanding 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 the disc, spindle and quick release nut clean before using to prevent them from being stuck by foreign objects. Material: Made of high-strength alloy, working without deformation , can withstand 40N torque and 12000 rpm. High speed, longer life. Compatibility: Compatible with all M14 angle grinders on the market; suitable for diamond cutting discs, abrasive discs, cup wheels, diamond discs and most other types of grinding discs.