Freud 90-106 Undersized Plywood Bit Set 4 PIECE UNDERSIZED PLYWOOD SET. Use this set to rout perfectly fitted grooves and dadoes in todays undersized plywood. Ideal for 1/4- to 3/4-inch plywood, this bit set also cuts composition materials, plywood, and hard and softwoods. They can be used on hand-held and table-mounted portable routers, and all bits have 1/4-inch shanks. Your purchase comes in a wooden storage box.