Quick Release Nut: Quick release nut with M14 thread for quick fastening and loosening of diamond discs, cup-shaped grinding wheels. Abrasive disc and other accessories. Anti-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 use to prevent them from being stuck by foreign objects. Material: Made of high-strength alloy, running without deformation, can withstand 40N torque and 12,000 rpm. High speed, longer service life. Compatibility: Compatible with all M14 angle grinders on the market; suitable for diamond cutting discs, abrasive discs, cup wheels, diamond pads, and most other types of grinding discs. Caution: Please check the nut for defects and damage before use to avoid causing safety accidents. Diameter 49mm, height 13mm, weight 114g. Delivery quantity: 1 piece Product color: silver Product size: diameter 49mm, height 13mm Note: Manual measurement, please allow an error of 1-3cm.