Dasqua 2-5.5" 0.001" inside tube micrometer with included extension rods provide a wide measuring range. resolution is 0.001". Strictly made in accordance with DIN863. Hard chrome plated. No-glare satin finish. Supplied with a standard gage for zero setting. Measuring rods hardened, ground and lapped. Includes one standard micrometer head from 50-63mm.