They are very similar to the 135 degrees positioners, but these have a combined system in which one plate turns 360 degrees with an electric engine and the whole leaning is made with a hydraulic system.
Another advantage is that with this system it is possible to control the height. They are common for big low weight parts where the height is important.
They are expensive because they require an external hydraulic source as well as power supply.
Their capacities are from 1 up to 15 tons. Although they can be bigger, there are better options because it becomes unaffordable.