If you need to grind down some weld beads or do some porting work, FindBuyTool SD-5 Ball Shape grinding burr will satisfy your expectatation. This ball shape carbide bur creates nice concave cut and hollow out an area easily. Technical information Head Dia. 1/2 Head Length 7/16 Shank Dia. 1/4 OAL 2-1/5 Ideal HRC 54< Cut Double Cut Head Material Tungsten Carbide Shank Material Alloy Steel Machine Die Grinders Pneumatic Rotary Tools High Speed Engravers Applications Steel Cast Iron Stainless Steel (INOX) Nickel-Based Alloys Titanium Alloys SHIPPING DIAMETER UNIT Pcs Package in Plastic Box Package Size 84 x 17 x 17mm