Spring Loaded Gate Caster, Heavy Duty Ageing Resistance Rubber Gate Caster with Universal Mount Plate, 250 Lbs Capacity, 5-Inch Hard Rubber Gate Wheel Suspensio, 2 Pack (2pcs-5Inch-Chrome)

I actually turned these because I found a better size, but what I bought was just like them. Takes the weight off your gate and makes it so easy to open/close. We used them on a pair of 12 foot driveway gates.

works good