Freud's patented Adjustable Tongue and Groove Set is the ideal set for building Shaker-style cabinet doors, or any project requiring precise tongue & groove joints with perfect finished surfaces. The exclusive design features cutters with opposing shear angles to eliminate chipping on both the top and bottom surfaces of your work. And the spacer system allows adjustment at .002" increments to produce joints in 1/2" to 1-1/4" thick material with grooves from 7/32" to 3/8" deep. Bits are 1/2" shank and should be used in table-mounted routers.