High Quality: Excellent high hardness steel material, wear-resistant and corrosion-resistant, not easy to deform. 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 clamping 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, cutting discs diamond wheels, grinding discs, pot discs and diamond plates.