For Measuring inside diameters of cylinders and rings, parallel surfaces etc. Quick reading figures - every thousandth numbered. Each rod is solid, marked with length, and assembled on one side of micrometer head. Rods have individual length adjustment. Heads and rods have hardened and ground anvils. Non-glare satin chrome thimble and sleeve. Furnished in case with rods, tools, and adjusting wrenches.
