Material: This carbide burr set/rotary bit set is made of premium Micro 100 tungsten Carbide steel which has long working life, Shank diameter: 3 mm(1/8 inch), Cutting edge diameter: 6 mm(1/4 inch),

Multi-Purpose: This rotary burr set includes everything you need for carving, engraving, polishing and removing sharp edges, being suitable for wood, stone carving, metal working and die grinders. The kit includes a massive selection of shapes for all types of cuts.

Great Processing Quality: with this burr set, the surface of your target is smooth after carving or engraving, therefore it can even process a variety of high-precision mold.