This slip-on style bathtub spout has a setscrew, which is a small screw located on the bottom of the tub spout. This slip-fit tub spout is designed to slip onto a 1/2" copper pipe without the use of any threads. The end of the copper that will be used must be free of burrs or rough edges, when using this type of spout. Aspen Chrome Finish Diverter Tub Spout - Die-Cast Zinc - 5/8" Compression Fitting Slips Over the Male 1/2" Pipe - 5-1/4" Length.