Features Helps you measure bolts, nuts and washers. Calibrated holes and molded thread profiles help accurately identify wire gauge, thread style, and length of threaded fasteners. Material / Plastic Length / 9 in Width / 3.8 in Thickness / 0.3 in Measures / Bolts, Nuts, and Washers Range / USS and SAE #6 to 1 in, ID #8 to 5/8 in, 0 to 4 in, Metric Gauge 6 to 22mm, Metric Length 0 to 100mm