A necessity in order to properly install one of our Billet Oil Coolers... Three different sizes available for all popular frame sizes (1-1/8", 1-1/4", 1-3/8") Machined from 1/2" 6061 Billet Aluminum and Chrome Plated. You do NOT want to mount the oil cooler without some kind of stand-off downtube clamp. Clamps ONLY. Oil Cooler NOT Included in this listing. ***Please make sure to measure the OD of your downtubes prior to making a purchase*** Dimensions: Length - 3-7/16" Width - 1-7/16" Thickness - 1/2" Oil Cooler Side ID - 1-1/8" Downtube Side ID - 1-3/8" 1-1/4" 1-3/8" (Please Choose) Weight - 3 Ounces Finish: Chrome Fitment: Most Harley Models Please make sure to measure the OD of your downtubes prior to making a purchase.