Backing Pad SCM 125mm dia x M14 + 22 mm locating pin

The 5″ back up pads with a central locating button are designed for use with 125mm surface conditioning discs.

SCM discs are supplied with a 22mm centre hole which allows for simple location on the back up pad. The location pin eliminates disc vibration and improves surface conditioning disc life as well as reducing back up pad wear.

For centralising surface conditioning discs on 125mm /5″” angle grinders. 

https://abrasive-systems.co.uk/abrasive-discs/velcro-plain-self-adhesive-discs/surface-conditioning-velcro-discs? attr_centre-hole-or-bore=22mm