How to checking abrasives discs inner hole diameter?

How to checking abrasives discs inner hole diameter?

The abrasives discs inner hole diameter is very important for safety performance.  Normally there are 3 kinds diameter for resin bonded cutting and grinding discs as below:

*  16mm - 5/8" inch ~  100mm cutting and grinding discs

* 22.23mm - 7/8" inch ~ 115~230mm cutting and grinding discs

* 25.4mm - 1" inch ~ 250~400mm cutting discs

If the abrasives discs inner hole diameter is bigger , then it's can't fixed well to the angle grinder results big vibration during working.  If the inner hole is small, then really difficult to fixed to the power tools.  We will regular checking our mould every week to make sure provide high quality abrasives discs to all customers.