Eight gaging surfaces per gage. Each gage checks primary, 1/2 primary and complimentary angles. Quick and accurate inspection of angles and I.D. or O.D. Chamfers in or out of the machine. Indispensable for every inspector, toolmaker, machinist, layout and draftsman. Complete with fitted case. Angles covered by this set: 1. (Angle Type: Primary, Range: 5 - 90°, Increments: 5°), 2 (Angle Type: 1/2 Primary, Range: 2-1/2 - 45°, Increments: 2-1/2°), 3. (Angle Type: Complementary, Range: 90 - 175°, Increments: 5°).