Plain Plug Gages Library Series Uses: Checking Location Measuring hole sizes and depths Go and No-Go gaging Setting micrometers Checking distances between holes For more details, please kindly visit our website. In addition, we also supply the following products: (1) Measuring Tools------Vernier Calipers, Electronic Digital Calipers, Micrometers, Dial Indicators, Squares, Protractors, Gages, etc (2) Machinery Accessories------Tool Post and Holder, Collects, Chucks, Drill Chucks, Milling Arbors, Sleeves, Vises, Working Tables, etc (3) Cutting Tools------including Drills, End Mills, Milling Cutters, Slitting Saws, Saw Blades, Reamers, Taps & Dies, Tool Bits, Carbide Inserts, etc (4) Machinery------Metal Working Machinery, Woodworking Machinery, Shear Bending and Rolling Machine, etc