A friend requested fittings to make a pyramid topper for a pvc cube, so I made these. They are designed to work with my series of 1/2" PVC fittings. You can build a box with a pyramid top by using the 3-way elbow for the bottom joints (http://www.thingiverse.com/thing:533492) and these pyramid elbows and topper for the top joints. The angle is 45 degrees, so it is scalable to any pvc length. . I will continue to add new fittings to the series and share them as a derivative of my original 3-Way Elbow. Please let me know if there is a fitting you need that I haven't created yet. . You are highly encouraged to make new derivatives. Please tag your new creations with #HalfInchPVCFittings.