Globe Marine DriveSaver&reg; Model 504PR Plus-Rated Marine Drive Coupling for ZF, Hurth, Borg Warner, Volvo, Velvet Drive and New Age Transmissions 5" Flange Diameter, 4-Bolts, 7/16" bolt diameter, 4-1/4" bolt circle, 2 1/2" pilot diameter, male/female configuration, 6" coupling diameter, 1" coupling thickness 675 - 1,600 ft/lb Engine Torque Rating Replaces R&D 910-057 and Isoflex IC-4500-HT couplings Fits many ZF, Borg Warner, Volvo, Velvet Drive, Technodrive and New Age models Made in the USA. Grade 8 hardware.