Quick-clamping nut: quick-clamping nut with M14 thread for fastening and quickly loosening diamond discs, cup-shaped grinding wheels. Abrasive 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 before using to avoid being stuck by foreign objects. Compatibility: Compatible with all M14 angle grinders on the market; suitable for diamond cutting discs, abrasive discs, cup wheels, diamond discs and most other types of grinding discs. Attention: Please check the product for defects and damage the nut before using it to avoid causing safety accidents. Diameter 50mm, height 12.6mm, weight 115g. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.