A pin wrench is the required tool that comes with an angle grinder and is used to remove a disc. This wrench resembles a pitchfork and has two knobs on the end that you insert into the drive bolt to loosen the nut holes that attach to the disc.
When should I replace my angle grinder disc?
Always replace a cutting disc if it shows any signs of damage. This includes, but is not limited to visible cracks and chips or any signs of bending or twists to the wheel. Cut off wheels should be replaced when they hit their expiration date. This can be found imprinted on the metal center of the disc.
