Absolutely phenomenal product. This invention helped me move my heaviest furniture and raise it to put pads underneath all of it. Whoever invented this is extremely intelligent and has obviously been in the furniture business for a long time. I've been a professional mover for 23 years and this is probably the best product I have ever came across in order to get pads under sliders and or dollies. It has height adjusters, and is extremely easy to use. My desk weighs right out about 300 lb and it didn't even start to bend the bar. For me this gets five stars all the way across the board if I could give 10 I would. Definitely do not pass this product up it is extremely useful in times of need and it will save your back and or your fingers and toes a lot of pain. The way that you measure is you take out the building blocks put them together properly, place the lifter in the adjusted slot lower down to one knee make sure you have whatever object you're sticking under your furniture right next to you and use simple Force to be able to place whatever you need under your furniture. Definitely, and I repeat definitely an absolutely phenomenal invention. I do have to say though if you are not experienced in moving furniture, or have the knowledge of lifting furniture the proper way please read the directions thoroughly. It will provide all the information you need and the adjustments accordingly. To the inventor, thank you very much and it's got a great price range. I've already seen a couple people trying to mimic this invention and there's come nowhere close to what this can do. The material is great and sturdy as is the bar and the holders. The size of it is easy to store away in a corner anywhere. It has no slippage and places directly in the spot that you want it and then you just simply place and lift. All of my furniture is extremely heavy and it lifted every piece with ease by myself and I also have ruptured and herniated disc in my back as well. Definitely a lifesaver. Have fun and be safe.