Ball Bur SD Cut Type Double Shank Dia 1/4 in Head Dia 1/2 in Head Length 7/16 in Included Angle Not Applicable Overall Length 6-7/16 in Trade Number SD-5L6 Primary Material Application Brass Bronze Carbon Steel Cast Iron Copper Stainless Steel Titanium Head Shape Ball Operating Speed - Maximum 50 000 RPM Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel