This Set of 20 piece Superior Diamond Bits Drill Is The Perfect Set For Engraving carving, grinding , etching on a variety materials With And Also Many Crafts. They Come In A Plastic Storage, Which Has A Separate Section For 20 pcs assortment of various shapes and sizes . Diamond coated bur set with 2.3mm shanks.20 PCs Diamond Bur Bits Drill For Polishing Engraving Carving Drill Bit Rotary Bit ToolNote: Remember to wear eye protection. Note: Photographs are for illustration purpose only. Actual item may slightly differ from the pictures shown.  Scorpion is committed to providing the customer with the best source for value possible on the market. You will enjoy the quality, function and usefulness of our products.