Set of Four Relay Test JumpersMake Testing Relays or Live Circuits Quick and Easy. Set includes four jumpers to fit the most popular size relays on domestic and import vehicles. Simply remove relay to be tested, insert correct jumper and insert relay into jumper. When using green four pin jumper be careful to alignpins on jumper and relay correctly. No need to pierce wires or connect multiple jumper wires. Jumpers have tabs for clamping and flat pads to place test leads on. Set comes in blow-molded case for storage.