For designing removable partial dentures, as well as precision and pin-retaining fixed restoration and all-ceramic bridge work. Used to determine the parallelism of two or more tooth surfaces, or any part of the cast of a dental arch. Included is a tool holder and locking nut, which allows the centering of standard dental burs for milling of wax, dovetail preparation and ledges. Kit 3 Undercut Gauges (0.010, 0.020, 0.030)