Color coded shafts and length ( 65mm / 110mm) in FPH / series ( 4.5 7mm) enable quick identification and compatibility with various electrical fastening tasks for wiring adjustments, circuit breakers installations, and other scenarios demanding rust resistant, screwdriver bits that prevents fastener drops Engineered for electricians, these screwdriver bits are crafted from high hardness alloy steel ( HRC63°) with anti rust phosphating, ensuring superior durability and secure screw grip The three piece set covers multiple screw head sizes with enhanced retention, streamlining electrical projects while reducing tool change frequency in confined workspaces Ideal for professional electricians, maintenance technicians, and enthusiasts requiring precise tools for electrical panel installations or appliance repairs, Manufacturer: YROHGKPN