Antrader Lift Up Top Mechanism Hardware Folding Spring Tea Table Hinge Furniture Air-Operated Lifting Rack Shelf Bracket for Coffee Computer Table, Sold as Pairs

Product working is very good, but the price is too high when compared to other seller in other sites not in Amazon. The price is almost double even more than that.

I BOUGHT TWO STAIR TREADS AND MOUNTED THEM ON A PIANO BENCH. ONE POPS UP WITH SOME EXTRA LEGS THAT FLIP OUT TO BALANCE IT. GREAT FOR REMOTE TEACHING FROM A COUCH. THE OTHER TREAD IS STATIONARY AND COVERS HALF THE PIANO BENCH MAKING STORAGE FOR A LAPTOP. EASY PEASY. THANK YOU SO MUCH. I SEARCHED FOR POP-UP TABLES FOR BIG BUCKS AND DID THIS FOR FAR FAR LESS.

I used these to make foldable skis on my jet sled for my flip offer ice shanty. They work great and fold up out of the way when not in use.

I'm an engineer, making parts work in the factory and troubleshooting batches of parts was my specialty. For the money you cant make this part. So I think they are rejects from some company. That said they may work great for your project.Reasons I would reject them if I was putting these on my company's product.1- parts punched and edges rough but no butts that will cut you.2- surface rust under paint on one of mine3- part does not open so intended lifted part remains parallel. My part will tilt my table top 3/8" in 20".4- table mounting angle is not flat and tilted maybe 1-2 degrees which Will out stress on screws over time.5- lower flange ( the one that mounts inline with motion) is not flat on all 3 mounting surfaces.6- If you are trying to mount these where you do not have access from underneath (like in my box) it it is going to be very difficult. It will take many marking tricks to get right the first time.Now the good.Product appears to hold about 20# up. Initial lift force required to get movement is less than 1#. Any movement will increase lifting force quickly. My planned use is to lift a light weight aluminum camp box lid. Luckily I have latches to lock it closed or else I know the kid would pop up during travel. Not having a level lid opened won't effect my plans even though this surface will be a work surface.Plastic bushings between moving parts.Hinge points are very tight.Overall product is very strong and very good value considering what you get for 21$.

Took a little extra time then when I felt it should have if it would have had instructions

Good value and seem pretty sturdy but... no instructions on installation, you need to figure it out yourself and, drilled hole is “shadowed by piston support” making it impossible to get a screw in. (See photo) Maybe a bolt of you have that option. Could have easily moved the hole in the design so there is no interference. Also, installation requires removing piston which is difficult to reinstall.