Quick-clamping nut: Quick-clamping nut with M14 thread for quickly attaching and detaching diamond discs, cup-shaped grinding wheels. Grinding wheel and other accessories. Non-slip design: The bottom has a fine frosted texture, so the nut locks the grinding wheel without slipping. Please wipe the disc, spindle and quick release nut clean before use to prevent them from being stuck by foreign objects. Material: Made of high strength alloy, runs without deformation, withstands 40N torque and 12,000 rpm stood. High speed, longer life. Compatibility: Compatible with all M14 angle grinders on the market; suitable for diamond cutting wheels, grinding wheels, cup wheels, diamond wheels and most other types of grinding wheels. Caution: Please check the nut for defects and damage before use to avoid safety accidents. Diameter 49mm, height 13mm, weight 114g. Delivery quantity: 1 piece