At ECCPP we offer Multi-Leaf Springs and trailer axle kit. Trailer axle Shackle Kit are Wide versatility is designed for tandem trailers and is suitable for all trailer models. Whether you own a utility trailer, boat trailer or camper, this unhitch kit provides a reliable connection for your towing needs. Product Features: Application: This trailer U bolt kit is compatible with 3,500 lbs round axle which axle beam diameter is 3.09" This u bolt kit is 3.09" wide, 7" long. Package Include: 8 x 7" long U bolts, U bolts diameter, 1/2", 16 x 1/2"-20 hex nuts, 4 x tie plates for 1-3/4" leaf springs. High Quality Material: This 3 inch trailer U bolt kit is made of high quality and durable steel, every part of this kit is designed as the original part, nuts and bolts are suitable with each other, better fit, no loose. Easy installation: Don't need special tool to install, directly replaces, removes the broken U bolts and nuts, installs the new kit. Only spend your several minutes. Specification: Thread Size:1/2" Diameter U Bolt Inside Width:3.09" U Bolt Inside Height:7" U Bolt Thread Length:2" U Bolt Diameter:1/2" Type:Trailer Shackle Kit Trailer U Bolt Kit Fitment:3500lb Trailer Axle Note: Does NOT Include Components for Mounting Axle to Springs.