I don't know I got them to work in the cable style door winch operated. Turned them around instead of the way I thought they should be and put a self driving screw into it and got them to work and also drilled a hole in center for the roller.
Been nice if it came with what it's for and a map or directions but that's how this is getting now.
Northwest. Iowa hog pig farmer ...old humane way of raising pigs. Thanks William