I mounted these casters on an old, large, heavy solid oak sideboard. The roller set I received was already in the sleeves but the instructions detailed how to remove them prior to installation. To install the casters on the legs of the furniture I used a 3/8" drill bit for the holes. It seemed to me that drilling a hole 1 3/4 inches deep was best. Using a rubber mallet, the sleeve was easily inserted into the hole in the furniture leg. After that, the rolls were simply inserted into the core by hand; A click signals locking. These reels are sturdy and don't look cheap. When installed they look very nice and work well. I recommend them - just wish I had gotten them a few years ago!