Solid aluminum attachment for using a Makita Die Grinder as a lathe tool post grinder, fits BXA quick change tool posts. Reversible so you can grind the front or the rear of the workpiece. Steel knurled thumbscrew for height adjustment. Has a step in the bore, wide end is 1.70" and the narrow end is 1.38". If you have a different grinder, I can machine a different bore size.