These are the supports that the pros use. They replace the usual cabinet base.
The support top detaches; you screw it onto the cabinet base or press-fit the sleeve into a drilled hole. To easily adjust the supports, you can either put a slot screwdriver into the side of the foot to rotate it or rotate from above.
Approximate support spacing is every 30". Altogether an excellent system, particularly suited to the uneven floors of today's houses. Adjusts from 3 3/4" to 6".
An optional kick-plate clip is sold separately to let you snap a kick plate directly onto the support post.