Taper Gage 15-30mm(5/8-3/16) metric/standard gap slot width hole size gauge Both Metric and Stadard reading 5/8''- 1''3/16 & 15-30mm The tool surface has measurement sketches Polished, bright and clean without burr, rust laser engraved line and will not rub off Made of stainless steel, miniature and light weight, pocket size Taper welding gauge measure of hole width / diameter