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 Made In USA Easy To Install | Bulldog Trailer Tongue Jack Gear Set