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 counter- nut is frosted to increase friction, so the disc is firmly locked to prevent slippage. Easy to replace: diameter 46mm, height 13mm, weight 111g. Angle grinder accessories can be easily installed and released without tools. Compatibility: Compatible with all angle grinders with M14 thread on the market. Note: The clamp nut can withstand 40Nm torque and 12000rpm high speed. To avoid a safety accident, check the nut before use to ensure that it is not broken or damaged.