The Milescraft MetalBushingSet is comprised of seven carbon steel one-piece bushings, two locknuts, one top hat adaptor, and a wave washer. The router bushings have outer diameters of 5/16in, 3/8in, 7/16in, 1/2in, 5/8in, 3/4in, and 51/64in. This router template guide set comes in a locking storage case with a peg hook and a foam insert to keep the accessories in position. Compatible with all router sub-bases with a 1-3/16in (30.2mm) center hole diameter and can be used with all Milescraft TurnLock products. These guide bushings are great for use when dovetailing, sign making, and inlay routing.