Carbide Bur End Type Radius Cut Type Double Shank Dia 1/4 in Head Dia 3/8 in Head Length 5/16 in Included Angle Not Applicable Overall Length 3 1/16 in Trade Number SD-3 Primary Material Application Brass Bronze Carbon Steel Cast Iron Copper Stainless Steel Steel Titanium Head Shape Ball Operating Speed - Maximum 60 000 RPM List Number 310D System of Measurement Inch Coating Bright (Uncoated) Head Material Carbide Head Material Grade C2 Submicron Shank Material Steel