This is a pipe sleeve used to sandwich together to hold 2 pipes together, I printed this out of PETG for strength, a friend helped me make this a while back so I forget the diameter of the pipe or the screw holes, sorry!!. it may be a 2" pipe though but not sure.Currently this is being used to hold up a roof of a dog cage as shown in the pictures, and so far it has held up great because it is very thick, but you can use it for whatever application it fits on.