This CMT router bit set is for producing tongue and groove shaker style doors. The key to this set is not only the adjustability in thickness of the style and rail frames of the door ( 5/8” to 1 3/8” ) but also the adjustability of the tongue width ( 13/64” to 17/32”) to allow a tight fit for imperial or metric sized panelling used for the centre portion of the door. This unique feature will help eliminate the panel rattle that can come up when using slightly different sized paneling. The difference between this set and the CMT 800.625.11 mission style set is the main cutter also produces a nice 18 degree bevel on the upper edge of the frame parts for a very attractive looking shaker style door. To be used on table-mounted routers. Avoid using these bits in hand-held routers. 2 Carbide-tipped cutting edges for long-lasting performance, anti-kickback design to allow you to work safely and bearing for easy template work.