58433-4 is a PRO-CRIMPER III Hand Tool Frame Assembly designed to crimp OPTIMATE connectors onto fiber optic cable. The tool consists of a frame, handles, jaws, ratchet, and die assembly (58424-1) featuring a single crimping chamber marked with "OPTIMATE 2.5 mm". It includes a ratchet adjustment wheel with eight settings for adjusting crimp height, with a target crimp height of 3.56±0.1 mm [.140±.004 in]. The tool frame accepts other die assemblies designed for PRO-CRIMPER III hand tool frames. This commercial-grade tool is primarily intended for field installation, repair, maintenance work, or prototyping in industrial, commercial, or institutional applications.