Quick release nut: This quick release nut with M14 thread is used to quickly attach and detach diamond cutting discs, cup wheels, grinding wheels and other accessories. Size 13 x 50 mm / 0.51 x 1.97 inches. Material: Made of high-strength alloy, high-strength performance without deformation, can withstand 40Nm torque and 12000rpm high speed, resulting in longer service life. Quick release structure: It has a quick release structure, which can be tightened very firmly and is not easy to loosen. It can be tightened or loosened without using a wrench. Compatibility: Suitable for all angle grinders with M14 interface on the market, as well as most types of diamond cutting discs, abrasive discs, cup wheels, diamond plates, etc. Note: Please check the nut before use to make sure it is not broken or damaged. Wipe off the abrasive, spindle and quick release nut before use to prevent foreign objects from getting caught on it.