features and benefits: quickly diagnose repair and restore truck and trailer harness connections includes 6 pin tester pin cleaner/resizer and chemical contact enhancer a preventative maintenance tool for cars light duty trucks and trailers first time tool! convenient retail and resealable package the ipa8027 is a small conveniently sized resealable clamshell holding 3 existing items the ipa 7897 8022 and 8030.The 8027 is the perfect solution for maintaining and repairing 6 pin truck and trailer connectors.The tester can be used to verify continuity and wiring configuration.The cleaner is designed to precisely remove pin corrosion and resize the pin to its factory specs.The deoxit is a patented solution for breaking the bonds of microscopic corrosion and improving pin mating surfaces.