Product Overview Standard & Metric Bolt & Nut Gauge Green Plastic Excellent for sizing bolts, screws, nuts (USS, SAE, and Metric) and twist drills. Determine the bolt diameter by pushing the bolt through the sizing holes, as well as, gauges hex nuts and washers (USS & SAE) size. Metric hex nuts and washers can be measured by holding them under the metric holes. The back includes a feature for measuring U.S. and Metric thread pitch. Notches on the front allow you to measure flat head metal and wood screws. Made of sturdy, light weight green plastic that resists water, alcohol, oil and grease. Reviews (No reviews yet) Write a Review