Made of stainless steel, miniature and lightweight, pocket size Accurate numbers and increments are engraved on the surface, easy to read Polished, bright and clean without burr, laser engraved line and will not rust Welding Taper Gauge: 1-15mm (1/64"-5/8") for measuring cylindrical bores With a hole on one side, easy to hang or carry, for measuring cylindrical bores, small hole diameters, slots, etc.