A distance ring that can change the inner diameter of our grinding wheels.
Press it into the grinding wheel and it will fit on a Ø20 mm flange.
The inner diameter of the grinding wheel is 38 mm.
SSM-2 models, from the 60s to the end of the 80s, used a flange with Ø20 mm.
In order for our grinding wheels to fit these old models, you must use the distance ring.