Feeler Gauges, Vernier Calipers -Cone Weld Thickness Gauge Bore Diameter Measuring Tool 3-15mm Highlights Generic Weld Thickness Gauge Cone Bore Diameter Measuring Tool 3 -15mm Made of zinc alloy, light weight. Accurate numbers are etched into the surface, easy to read. Measuring range: 3-15mm (0.118-5/8 inch). Accuracy: 0.1mm / 1/64". For measuring cylindrical bores, small hole diameters, slots, etc. Total length approx. 19.5mm / 7.67inch. specification: Material: zinc alloy Color: silver Measuring Range: 3-15mm (Single Side) Total Length: 19.5cm / 7.67inch Package Includes: Cone Gauge Freelometer, 1 piece Note: The color may differ from the display, please understand. allow 1-3mm error due to hand test.