GM Alternator Double Grove Pulley - Chrome Steel 

Specs: 

• Fits: GM Small Block & Big Block Chevy Engines, Pontiac, Oldsmobile, Buick, Cadillac & Ford Applications. 
• 5/8" (16mm) Bore Size 
• V-Belt Type (3/8" Width)
• 2-15/16" Diameter
• Steel Material
• Chrome Finish 

Notes: Pulley only, does NOT come with nut.