Bought to lift a heavy lid on a bear proof bin. Once installed, they were strong enough to lift the lid but seemed to struggle for the last few inches. I need to help him open up fully. Seems odd because they seem to have enough pressure to open the first 80% of them very quickly and once opened they require significant pressure to close. Also, the included mounts are pretty flimsy. They bend slightly under the pressure of the cylinders. I had to double the brackets on each end.