FEATURES SWIVEL DESIGN: Large Hardened Double Ball Raceway 5/8" King Pin TOP PLATE: 1/4" Steel LEGS: 3/16" Formed Steel FINISH: Zinc Plate Brake Available 2" Tread Width

The swivel rig features a dual ball bearing raceway for easy swiveling and greater load capacity. All wheels and rigs are compatible with industry standard dimensions.

• Wheel Diameters are 4", 5", 6" and 8".
• The rig width is 2-1/2" (inside) with holes for a 1/2" diameter axle 3-1/2" long.
• The "wheel hub" width is 2-7/16" bushed down to accommodate a 1/2" diameter axle.
• A new bushing comes with the wheel.
• Axles come with the rig.

These dimensions should be universally compatible with most modern truck duty casters. There are some casters with 7/16" axles. The only problem I can see with using these is if you have a brake on your rig (with our 1/2" diameter bushings your brake may not function properly). If you don't have a brake on your rig then the 1/2" bushing that comes with our wheels and your 7/16" axle should work together fine. One final note: If you are having a problem achieving a certain height it is possible to put a smaller wheel into a larger rig. You will need to call us for assistance when that need arises (1-800-466-2713).

Our shopping cart is not fully automatic, every order is reviewed for inconsistences and errors. If we see anything out of order that no customer created notes explain, we will call or E-mail you before we process your order.