Wheels seem decent for the price.
They have holes big enough for M8 bolts.
The wheel surface is quite soft, and wider than most wheels I'm used to.
The brakes are easy to engage but very difficult to disengage.
I'm hoping they might wear in a bit, but for now i often take some tool or stik to disengage them. if you install these under a case, install them clos enoug to the edge so the wheels really stick out or you won't be able to release the brakes without getting on your knees.
Overall for the price I might buy them again.