CMT 891.512.11 2-Piece Rail & Stile Bit Set, 1-1/8-Inch Diameter, 1/2-Inch Shank Board Thickness from 5/8 to 7/8-Inch, 3-1/8-Inch Overall Length. Mill a delicate 3/16-Inch thumbnail profile in stock from 5/8 to 13/16-inch thick. Non-Stick Orange Shield Coating, Anti-Kickback Design, Equipped with Bearing. 2 SinterHip Hi-Density Industrial Chrome Carbide cutting edges for long-lasting performance. CMT bits were rated the best overall in comparison to other brand (Test by Wood Magazine).