ITEM NAME:10pcs Wool Polishing Brush Grinding Wheel Brushes for Drill Rotary 3C Features 100% brand new Very nice for buffing and polishing all types of jewelry and precious metals. For use with most Rotary Tools that accept 1/8" Shank. Material: Fine Wool. Shank Dia: 1/8 inch (approx 3mm). Wheel Dia: 22mm. Shank Length: 40mm Package List:.10pcs Polishing Wheel Brush. For use with most Rotary Tools that accept 1/8" Shank. Material: Fine Wool. Wheel Dia: 22mm.