2 piece set with four cleaning tips Clean male and female connectors Remove corrosion from connectors Enhance electrical coated points Extend harness life The 7-way Round Pin Terminal Cleaners from Innovative manufacturers of America (patents pending) are precision manufactured instruments for the purpose of removing corrosion and resizing 7-way Round Pin Tractor/Trailer terminals. Built to last a lifetime, the innovative design uses special grooves for removing corrosion as opposed to the traditional brush method.