This Sks rifle gas port cleaning tool this is a must have tool for gunsmiths or anyone who owns a sks rifle to insure the rifle continues to cycle your 7.62x39mm ammunition properly. This sks rifle tool eliminates carbon build up from your sks rifle gas port. Simply unload and disassemble your sks rifle insert the sks gas port reamer into the gas port of the sks rifle turn the reamer clockwise until fouling is removed. This tool is an Original Military Surplus Cleaning Tool 3.14 inches made from solid steel.