The Blower Shop Idler Pulley Assembly - 4" Diameter SB51201 Twist-lock backing pad accepts 2"

Twist-lock backing pad accepts 2" twist lock style cleaning or sanding discs and features a 1/4" arbor to work with most drills or 90° die grinders

The rugged design covers all the fender holes for a light weight option and sleek body profile

Z-20 Shield

Mounting Hardware Included: Yes

Mahle Hard Anodized Forged Pistons w/Low Friction Coating

The Blower Shop Idler Pulley Assembly - 4" Diameter SB51201 Twist-lock backing pad accepts 2"Product Description: Supercharger Idler Pulley 2 Bearings Hardware Billet Aluminum Polished 6 71 to 14 71 Superchargers The Blower Shop started in 1984 as a supplier of high end superchargers for top fuel dragsters and race boats. As time went on they began to develop their race superchargers for the street. Today they offer a wide variety of superchargers and accessories for full on race cars, street driven vehicles and marine applications.