Welding Taper Gauge slot width gap hole size gage metric & inch standard 2.7mm This gauge is both Metric & Inch Reading The taper weld gauge body thickness is 2.7mm Accurate figures and increments are etched into surface, easy to read Made of stainless steel, miniature and light weight, pocket size Polished, bright and clean without burr, rust laser engraved line and will not rub off