: Excellent high-hardness steel material, wear-resistant and corrosion-resistant, not easily deformed. Self-locking Flange Nut: Allows you to fix the cutting discs conveniently and quickly, without the need to use a wrench or additional tools. Pull Ring Retaining Nut: Quick and convenient to install and remove the grinding discs on the angle grinder, just screw it on and off. Angle Grinder Clamping Nut: Quick-release nut allows you to fix the grinding discs or other accessories on an angle grinder with an M14 spindle, compatible with most M14 angle grinders. Quick Release: Grinder Nut Allows you to quickly change most M14 grinding accessories such as circular saw blades, cup wheels, diamond cutting discs, grinding discs, pot discs and diamond plates. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.