Locking Nuts - Excellent 45# steel material with high hardness, wear and corrosion resistance, not easy to deform. Self-Locking Flange Nut - Allows you to fix the cutting discs conveniently and quickly, with no need to use a wrench or additional tools. Pull-ring Type Retaining Nut - Quick and Convenient to install and remove the grinding discs on the angle grinder, just simply screw it on and off. Angle Grinder Clamping Nut - Can secure grinding discs or other attachments to an angle grinder with an M14 spindle, compatible with most M14 angle grinders. Quick Release Nuts - Allow to quickly change most M14 grinding accessories such as circular saw blades, cup wheels, diamond cutting discs, grinding discs, pot discs, and diamond plates., Manufacturer: BJdfgE