The Milescraft metal bushing set is comprised of seven carbon steel one-piece bushings, two locknuts and one top hat adaptor. This router template guide set comes in a locking storage case with peg hook and a foam insert to keep the accessories in position. Compatible with all router sub-bases with a 1-3/16 in. (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.