Bore gauge / Taper Gage 1-15mm & 15-30mm Stainless Taper Welding Gauge Test Ulnar Inch & Metric Manufactured from stainless steel with permanently engraved graduations. Accurate taper throughout the length of the gauge makes it a convenient tool for measuring diameters of small holes, slots etc. With imperial graduations on one side & metric on the other, this is an ideal tool for die makers, machinists and on inspection floors Feature: 1. Accurate figures and increments are etched into surface, easy to read 2. Polished, bright and clean without burr, rust laser engraved line and will not rub off 3. Made of stainless steel, miniature and light weight, pocket size