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The Vermont Gage steel go (+) plug gage is a class ZZ metric gage for calibrating measuring equipment and gage parts. A certificate of accuracy traceable to National Institute of Standards and Technology (NIST) is available for each gage, and each pin is marked with its size and direction of tolerance in sizes over .060”. Each gage is sealed in a volatile corrosion inhibitor (VCI) bag and packaged with a rust preventative. All gages are made of cold-stabilized tool steel 60/62 Rockwell c (Rc), measure 2” long, are within .00001” round (per ASME B89.1.5), and have at least a 10-microinch finish for a smooth finish. Sizes are available from .20 mm to 25.50 mm in increments of .02 mm, with a tolerance of -.005 mm for longer wear. Plug gages are precision-ground cylindrical steel plugs used to measure the diameter and depth of drilled or machined holes. They are available in different classes, based on acceptable tolerance (allowed deviation from the stated size). Standard tolerances and classes for cylindrical gages up to .825” are as follows: Class XX (.00002 or .0005 mm), Class X (.00004 or .0010 mm), Class Y (.00007 or .0018 mm), Class Z (.0001 or .0025mm), and Class ZZ (.0002 or .0050 mm). For gages with a wider diameter, tolerance gradually increases for each class. Vermont Precision Tools manufactures precision round and ground pins, perforators, and special punches. The company, founded in 1968 and headquartered in Swanton, VT, formed Vermont Gage division in 1980 to manufacture fixed limit gages. It meets International Organization for Standardization (ISO) 9001:2000 standards. Supplied with a certificate of accuracy traceable to National Institute of Standards and Technology (NIST) Go (+) gage for measuring the lower limit of a hole Available in a range of sizes from .20 mm to 25.49 mm Made from tool steel 60/62 Rockwell c scale (Rc) cold stabilized for durability Class ZZ (tolerance of .0002”) for longer wear UPC 662631088682 Material tool_steel Brand Name Vermont Gage Item Shape Cylinder Unit Count 1.0 Count Item Weight 0.01 Ounces Part Number 112322170 Manufacturer Vermont Gage Model Number 112322170 Item Diameter 22.17 Millimeters Number of Items 1 Global Trade Identification Number 00662631088682