THIS IS FOR A NEW 1955 1956 1957 CHEVROLET 265 283 V8 DISTRIBUTOR WIRE RUBBER GROMMET. THIS IS THE RUBBER GROMMET THAT PROTECTS THE ELECTRICAL WIRE THAT RUNS THROUGH THE SLOT ON THE BASE OF THE DISTRIBUTOR. THE WIRE HOLE IN THE GROMMET IS NOT PUNCHED ALL THE WAY THROUGH SO YOU CAN DRILL IT THE SIZE OF WIRE YOUR CAR NEEDS. I HAVE SEEN SOME PEOPLE PUT A SLIT TO OPEN IT UP ALSO. ONLY ONE NEEDED PER CAR. SKU #2415