Quick-clamping nut : Quick-clamping nut with M14 thread For quick fastening and loosening of cup-shaped diamond discs grinding wheels. Grinding wheel and other accessories. Non-slip design: The bottom has a fine frosted texture, so the nut can block the grinding wheel without slipping. Please wipe the washer, spindle and nut dry. Quick release before use to avoid being caught by foreign objects. High Quality Material : Made In Alloy With; High strength, runs without deformation, can withstand 40n torque and 12000rpm. High speed, longer life. Compatibility; : Compatible with all M14 angle grinders on the market ; Suitable for diamond cutting discs, grinding wheels, cup wheels, diamond pads and most other types of grinding wheels. Note: Protective gloves are required when using the angle grinder . Please make sure it is installed well. Before use.