Quick-release nut: quick-release nut with M14 thread for quick attachment and release of diamond blades, cup-shaped grinding wheels. Sanding disc and other accessories. Non-slip design: The bottom has a fine frosted texture so that the nut blocks the grinding disc without slipping. Please wipe the disc, spindle and quick release nut clean before using to prevent them from being stuck by foreign objects. Material: Made of high strength alloy, working 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, abrasive discs, cup wheels, diamond backing pads and most other types of grinding discs. Attention: Please check the disc for defects and damage. #39;nut before using it in order to avoid causing safety accidents. Diameter 49mm, height 13mm, weight 114g. LRFR is committed to providing each customer with the highest standard of customer service.