This Is a Hinge Point Drill Jig from Robart. FEATURES: Guides and drills mounting holes for hinge points. Adjustable for all control surfaces. It's made of hardened steel. Incorporates removable drill bushings. Instructions provided. INCLUDES: One Drill Jig Two Bushings REQUIRES: Drill (1/8" and/or 3/16") SPECS: Bushing Diameters: 1/8" 3/16"