Brand new machined aluminum double groove water pump pulley. This pulley fits 1955-68 small block chevy's with a short water pump and has deep grooves that prevent belts from slipping. This pulley is 6.60 inch diameter with a bolt circle of 1.75 inch. Machined aluminum finish. Sold each.Details:Fits all Chevrolet SBC Engines (265, 283, 305, 327, 350, 383, 400) When Used With A Small Water Pump6-5/8" Diameter3" Height1-3/4" Bolt Pattern5/8" Center HoleMachined Billet AluminumSold EachAlso available in Polished Aluminum and Black Aluminum