Size:8.5mm Black High Performance UNIVERSAL Spiral Core Spark Plug Wires With 135 Degree (A.K.A. 45 degree) Spark Plug Boots. Product Compatibility:Compatible with BIG BLOCK CHEVY, SMALL BLOCK FORD & MOPAR or any application that can use a 135 degree / 45 degree spark plug boot with a male/HEI distributor cap!