Dynomax Hardware Gearbox 41962 They advertise "burr-free design for proper installation” Well it has burrs, be careful when handling rough cuts, they're made like someone used a machete, not one Machine to cut the pipe straight Rounded on one end and the other end of the 2 1/2 ID was a bit broken. I don't want to try and fix myself in circles, this is heavy metal, no complaints.