This solidly constructed all steel gage was developed to allow the user to determine the diameter and thread pitch of 28 of the most commonly used Bolts, Nuts and Washers in the United States.

• 17 Standard US sizes     3/4” to 6/32
• 11 Metric diameters  M16 to M4
• Also determines Wood / Sheetmetal screw sizes #14 to #4
• Will measure lengths up to 12” or 200 mm
• Can be fastened to work bench or tool box

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