I have a small woodshop so floor space is at a premium.  Used these casters to put wheels on a table and band saw.  They work well and the locks hold better than I expected.  Getting new tools so will need to buy more.  I like the locking mechanism, much easier to set and release than the rocker arm lock affixed to the axle of common casters.  And, it locks the swivel too.  I used two of the non-swivel casters on the back of my sliding miter saw and it stabilized the table very well while keeping it easy to move.  No point to using four of the swivel type, which makes the table less stable.