BeehiveĆ Valve Spring Kits designed as drop-in performance valve train upgrades Beehive valve springs deliver a host of well-documented benefits over conventional cylindrical valve springs Increased rpm capability with no rocker box clearance problems Designed to work with the limited valve spring installed height of the Harley V-Twin engine, small spring pocket and high-lift cams Made in the U.S.A.. SPRING KIT .585 W/TOOL ST