CMT 800.625.11 Adjustable Tongue and Groove Bit Set for Mission Style Cabinet Doors, 1/2-Inch Adjustable at 0. 002" increments for groove width from 13/64" to 17/32" Cut stock thickness 1/2 through 1-1/4-Inch 2 Hi-Density Carbide cutting edges for long-lasting performance For flawless performance on material such as plywood, softwood and hardwood Perfect fix for undersized plywood panel