1 NEW steel deep grove 3-1/4" Dia. pulley
Machined from solid bar stock.
The larger diameter reduces alternator RPM reducing wasted horsepower.
The .575" deep grove helps keep the 3/8in. or 13/32in. belt in place.
Fits most automotive Delco, Ford & Many other alternators with .675" (17mm) shaft size,
including Delco 10DN, 10SI, 12SI, 15SI, 27SI/Type 100 Series, CS121, CS130, CS144, & Ford 1G Series ER/EF, 2G Series IR/EF Alternators.