When locked it is firm, when unlocked it's a breeze to move on concrete floor. They are great and roll along just fine on the smooth concrete inside and on the brushed rough concrete in the driveway. Esta muy bueno.

With the sturdiness of the wheels, i'm not afraid that someone will accidentally sit on it and break anything. They appear sturdy but swivel and roll easily. Lock on the wheels is smooth and easy to use without having to really crank down on it.

Casters hold the weight and the base rolls very smoothly. Easy to attach and move smoothly over different floors. One of my photos is a close-up of a caster on a dolly.

The brakes on the dollies are fairly easy to engage and disengage. Even with sawdust on the floor they roll smoothly and quietly. The breaks are easy to release and latch and the quality is great!

These castors make woodworking machines movable around the shop. I have them mounted to workbench legs. Used these casters to build a portable table for a saw.

I love that the wheels came with bolts screws nuts and washers which covers various applications depending on your project. Only thing i would have preferred is if the washers fit both the wood screws and bolts.

The axels are too large a tolerance (sloppy) for a stable bench or crane. Returned these and just ordered more of the jgjc brand.