This Kupo 80mm Brake Caster 22mm Round (Set 3) is a set of 3 steel and rubber 3.0- 5/32" (80mm) casters which fit 7/8" (22mm) round legs. They feature an integral braking system that prevents rolling can be actuated with a tap of the foot.
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I thought that I was going to have to drill out a hole on each of my background stand's legs, but was thrilled to discover they (Impact) already had the necessary holes! This is vital for the wheels to lock into position onto the legs. I had previously purchased a cheaper set with no such lock and despite advice involving gaffer tape the wheels would spin around the leg with any amount of pressure and become useless. These however work great, with the legs in the fully extended position to make the angle correct with the wheels. Thanks to the critical locking nub, the wheels stay in place with no worries. The wheel locks also work well, if a bit awkward to engage.
We bought a set of these for one of our combos and it's changed the way we work. Having our key on wheels, while not always feasible, is absolutely amazing most of the time. Between studio setups, corporate spaces, warehouses, etc, we're largely on hard flat floors, so these make moving a heavy key a breeze. It's honestly one of those buys that has us wondering why we waited so long.