Bulldog/Fulton 500106 Trailer Tongue Jack Gear Set; Use With Bulldog 139/ 159/ 170 Series 5000 Pound Lift Capacity Sidewind/ 2000/ 3000/ 5000 Pound Lift Capacity Crown Jack Bulldog Trailer Jacks offer you proven quality, performance, and versatility. Our wide range of products has you covered whatever your application. For heavy-duty loads where a combination of speedy operation and a variable cranking ratio is needed, Bulldog 2-Speed Square Jacks are a good solution. They also offer a convenient way to position your rig on the drive or the work site. Bulldog also offers a wide range of accessories and replacement parts to keep your rig operating at peak performance. Compatibility: Bulldog 139/ 159/ 170 Series 5000 Pound Lift Sidewind/ 2000/ 3000/ 5000 Pound Lift Crown Jack Includes Wear Plate: No Includes Gear: Yes Includes Pin: Yes Includes Bushing: No Includes Compression Spring: No Marine: Yes