Router Guide Bushing Set: Our 11-piece dovetail guide kit will work with any template, pattern, or jig for perfect duplicate routing. This router guide bushing kit comes with template guides, lock nuts, 1/4" and 1/2" shank custom centering bits, & a storage case Ideal For? These router parts & accessories are ideal for stair, pattern and hinge routing, dovetailing, and craft/hobby work. This router guide bushing kit fits any base with a 1-1/4" diameter center hole. Designed With Maximum Utility: Our template router guide kit is designed with maximum utility in mind! This router bushing kit features a 1-1/4" center opening to accept guide bushings and a ring of external mounting holes which form multiple patterns to allow attachment to the most popular routers. What’s Included? This router bushing guide kit includes (7) Template Guides, (1) 1/4" and 1/2" Shank custom centering bits, (2) Lock nuts, (1) Storage case. Easy Storage & No Debris Mess: Our router bushing kit for templates, patterns or jigs includes a carrying case for easy transportation, safe storage, and simple organization. The rings have six additional holes that are dispersed evenly around the center to provide an escape for routing debris. Rockler Woodworking Router Guide Bushing Kit (11-Pieces): Our woodworking router bushing kit will work with any template, pattern, or jig for perfect duplicate routing. This router bushing guide set is ideal for stair, pattern and hinge routing, dovetailing, and craft/hobby work. Our guide bushing set fits any base with a 1-1/4" diameter center hole. This router bushing set is affordably priced and designed with maximum utility in mind. Router bushings are made from brass so you don’t have to worry about rust. Features a 1-1/4" center opening to accept guide bushings and a ring of external mounting holes which form multiple patterns to allow attachment to most popular routers. Also available from Rockler, the Guide Bushing Router Plate (sold separately). Affordably priced and designed with maximum utility in mind, this router plate features a 1-1/4" center opening to accept guide bushings and a ring of external mounting holes which forms multiple patterns to allow attachment to most popular routers. Six additional holes are dispersed evenly around the center to provide an escape for routing debris. Router Guide Bushing Kit Tech Specifications: 1/4" (inside) x 5/16" (outside) - 9/32" (inside) x 3/8" (outside) - 11/32" (inside) x 7/16" (outside) - 13/32" (inside) x 1/2" (outside) - 17/32" (inside) x 5/8" (outside) - 21/32" (inside) x 3/4" (outside) - 5/8" (inside) x 51/64" (outside).