Globe Marine DriveSaver&reg; Model 504 Marine Drive Coupling for ZF / Hurth, Borg Warner, Volvo, Velvet Drive, Technodrive 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 ft/lb Engine Torque Rating. Order 504PR for higher torque. Fits many ZF, Borg Warner, Volvo, Velvet Drive and New Age models Don't get stranded out on the water -- order a spare Drivesaver today. Grade 8 Hardware. Made in the USA