100pcs Leather Polishing Burs Polishers Buffing Rotary Tool Shank 1/8 inch 3mm Cone Column They work in both drills and in rotary tools such as Dremel and on a variety of surfaces Shank diameter: 1/8" Size: Bullet shape-- 4mm, 5mm, 6mm, 8mm and 10mm, Cylinder shape-- 4mm, 5mm, 6mm, 8mm and 10mm 10 pieces each size and shape, total 100 pieces. Material: cow leather