Designed for rounding the edge of plastic sheets or parts., #46466, (D) diameter 1/4, (r) radius 1/4, (b) Cutting height 3/8, (D) shank 1/4, overall length (L) 2-1/2, B1 9/32, Type spiral, for plastic thickness 1/4, flutes 1, 46466 Solid Carbide 'o' Flute plastic edge rounding 1/4 dia x 1/4 radius x 3/8 x 1/4 inch shank