CMT 891.503.11 2-Piece Rail & Stile Bit Set, 1/2-Inch Shank, 1-3/4-Inch Diameter, Carbide-Tipped Male & female bits for material from 23/32 to 7/8-Inch thick 2-51/64-Inch Overall Length Make rail and stile joints to buid your own doors Use on router tables only Clean, precise and well-crafted for strength Ideal for jobs requiring perfectly matching profiles 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)