The dynamic line features a modest down-shear for an excellent finish. The helix bits have a spiral-like twist to the cutting edges, making them especially good on difficult materials such as melamine. An adhesive-trapping gap between cutting edges and pilot bearing is featured on tools #47111 & #47113., #47182, diameter (D) 3/4, cutting Height (B) 5/8, shank (D) 1/4, overall length (L) 2-1/4, Type flush helix, 47182 carbide Tipped dynabit laminate trim flush helix 3/4 dia x 5/8 x 1/4 inch Shank