Finally, a factory matched Tongue & Groove router bit set that works perfectly with thin stock! Precisely machined slot cutters feature 3-wings and anti-kickback design for efficient and safe cutting. Unlike standard tongue and groove router bit sets designed to work with 3/4" thick material, our new bits are factory matched to give you a perfect 3/16" tongue and groove. The set produces very strong glue-joints with a full 5/8" wide profile! Use this set to make flooring, wainscoting, side paneling and fine furniture. Ideal for 3/8" to 5/8" thick material.