1/4inch (6.35mm) compatible with , , , , , , , , , tools. Incredibly durable,sharp and well-balanced and cuts through metal,wood,stone and plastic like hot knife cuts . High Percision: for burr fluting. Shape : Cylindrical,Ball Nosed Cylindrical,Ball,Ball Nosed Tree. Great for cleaning up holes, sharp edges, welds, slots and hard to reach areas. Comfortable: Working with reduced vibrations and less noise. Carbide Burr Set Cut Type: Double Cut Optimal Fix Type: 1/4 inch (6.35mm) Head Dia.: 6mm,8mm and 10mm, Head Length: 6.8mm to 25mm, Dia.: 1/4 inch (6.35mm), Overall Length: 52mm to 70mm. Materials Applications: Hard Wood, Balsa, Wax, Soapstone, , Marble, Granite, Concrete, Steel, Hardened Steel, Weld-Seam, Stainless Steel, Brass, Copper, Bronze, Aluminum, Cast Iron, Cobalt, Nickel, Titanium, Zinc, Earthenware, Terracotta, Porcelain, Fiberglass, Plastic, Rubber, Fiber-Reinforced Plastics and so on. Burr Applications: Carving, Engraving, Sculpturing, Deburring, Contouring, Chamfering, Milling, Cleaning, Porting, Cutting, Grinding, Polishing, Elongating Holes etc. Recommendation: 1. Grind weld, grinding hardened steel, a tool drive output of 300-500 is optimal. 2. For beginners pls choose more smaller burr head dia. than the holes' dia. and swing-move the burr to elongate holes, otherwise the burrs will chatter in narrow holes caused by not grabbing tool and stably. 3. Do not press hard the tool, let speed do the work. Material: alloy Color: Silver Package Contents: 1 x Rock Carbide Burr Set(10pc) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.