3/8 in, Length of Cut 3/4 in, Overall Length 2-1/2 in, Trade Number SB-3, Abrading Application General Purpose Use for Smooth Finish, Coating Bright (Uncoated), End Type Flat End, Head Material Carbide Carbide Bur, 1846 SB-3 CLE-SB Cylindrical Bur w/ End Cut Standard Cut 3/8"x1/4" Hardened Steel Shank.1/4 in, Head Dia.