Edelbrock 4.000in. pulley part #15846 allows you to fine tune the airflow and performance of your Edelbrock C7 Corvette or Enforcer Supercharger system to your preference. The Edelbrock #15846 features a 10-rib design for use with our Edelbrock street rod and muscle car Supercharger systems. Edelbrock pulley part #15846 offers a Black Anodized finish. - 4in. 10-Rib Edelbrock's/C Pulley in Black Finish for Enforcer Systems