Robust: Made of high strength alloy with M14 thread for quick connection and quick release cutting discs, grinding wheels and other accessories. Non-slip design: The back of the lock nut is frosted to increase friction, so that the disc is firmly locked to prevent slipping. Easy to replace: diameter 46mm, height 13mm, weight 111g. Angle grinder attachments can be easily installed and released without tools. Compatibility: Compatible with all angle grinders with M14 thread on the market. Note: The clamping nut can withstand a torque of 40 Nm and a high speed of 12,000 rpm. To avoid a safety accident, check the nut before use to ensure that it is not broken or damaged.