The Ryobi 5-Piece Straight Router Bit Set includes 1/4 in., 3/8 in., 1/2 in., 5/8 in. straight router bits with a bonus 5/16 in. bit. The bits feature carbide-edged blades for durability and have a maximum RPM rating of 28,000. Straight bits are great for dressing edges in preparation for jointery.