The installation was simple once the appropriate hole was drilledSeems strong and the adjustability was good for uneven floorsWORKED WELL ON DINNING TABLENothing high tech about these but they work as intended. The installation description suggest using a 5/16" drill bit to install. I think that is to large. I would suggest using 19/64 or 9/32 as a more appropriate fit for the shaft.I got tired of using the sticky kind of felt pads to protect our wood floor. These are the permanent solution. Will have to order a complete set for dining table/chairs.No instructions so unless you are a professional carpenter you have to guess the bit size need for the pre-drill. And how to install after that is a complete mystery. Buy something else to level your furniture from another buyer who puts a little more thought and effort into instructions for their products.Excellent idea. Robby (iRobot) struggled to get under the living room furniture.After a simple install of these wonders he zooms around like a champ.Great packaging and arrived on time.These are supposed to have a nut which allows you to tighten down the leveler at a point higher than it’s lowest setting. If you don’t ha e it at its lowest setting they will never stay in the spot you dial them into without the additional nut…. It’s like someone ordered a large quantity repackaged and didn’t add all the partsThese worked perfectly for what I needed. I put these on the back of some furniture to prevent it from bumping into/damaging the wall (saw a helpful tip online to use these for this purpose)