This outside micrometer set is designed for high-precision measuring across four ranges from 0-4 inches. It features carbide-tipped measuring faces, clear sleeve markings, a ratchet thimble, and a lock nut for consistent, reliable readings. The set includes calibration rods, a zero-adjust wrench, and a protective hard case for organized storage and transport. Built for metalworking, engineering, and quality control tasks, it offers durable all-metal construction for long-term use.