18" 4 Blade Steel Fan 32 Deg. Pitchmechanical Cooling Fan, 18 In Fan, 4 Blade, 5/8 In Pilot, Universal Bolt Pattern, Steel, Black Paint, Eachdiameter18 Infan Stylerigidblade Quantity4Pilot Diameter5/8 Inrotationstandardbolt Patternuniversalhub Materialsteelhub Colorblackhub Finishpaintblade Materialsteelblade Colorblackblade Finishpaintquantityeach