Quick-release nuts: Quick-release nuts with M14 thread for quick attachment and removal of diamond discs, cup wheels, grinding wheels and other accessories. Anti-slip design: The bottom is finely matted, so the nut holds the grinding wheel firmly. Wipe the disc, spindle and quick-release nut thoroughly before use to avoid jamming. Material: Made of high-strength alloy, non-deformable, withstands 40 Nm torque and 12,000 rpm. High speed, long service life. Compatibility: Compatible with all commercially available M14 angle grinders; suitable for diamond cutting discs, cup wheels, diamond pads and most other types of grinding wheels. Caution: Please check the nut for damage before use to avoid accidents. Diameter: 49 mm, height: 13 mm, weight: 114 g.