The sharpening stone is of good quality but the centre hole for the bush is 1 or 2mm too small in diameter and needs to be enlarged to fit a standard Italian FAV skiving machine bush. This was done and now overall it fits satisfactorily. The hole diameter is not listed in the specifications but looked to be standard size when purchasing. Unfortunately just a little too small.
The sharpening stone is of good quality but the centre hole for the bush is 1 or 2mm too small in diameter and needs to be enlarged to fit a standard Italian FAV skiving machine bush. This was done and now overall it fits satisfactorily. The hole diameter is not listed in the specifications but looked to be standard size when purchasing. Unfortunately just a little too small.