This professional-grade 4" key file set from PFERD is ideal for a wide range of delicate and light-duty filing applications. Each file in the set features a second cut for controlled material removal and is designed for use on small components, fine surfaces, and tight spaces. The set comes complete with a convenient quick-mounting handle for fast, secure tool changes—enhancing productivity and user comfort. Whether you're working in electronics, model making, instrument repair, or general precision engineering, this file set delivers outstanding performance and control.