1/4 in, Head Dia.
.Carbide Bur,Inverted Cone,5/8,1/4 Shank 5/8 in, Head Length 3/4 in, Included Angle 18 Degrees , Overall Length 2 1/2 in, Trade Number SN-6, Primary Material Application Brass, Bronze, Carbon Steel, Cast Iron, Copper, Stainless Steel, Steel, Titanium, Head Shape Inverted Cone, Operating Speed - Maximum 50,000 RPM, List Number 310N, System of Measurement Inch, Coating Bright (Uncoated), Head Material Carbide, Head Material Grade C2 Submicron, Shank Material Steel Carbide Bur, End Type Flat, Cut Type Double, Shank Dia.