Do it Best Plastic Hanger Straps offer a quick and inexpensive way to hang PVC, ABS, galvanized, black iron or cast iron piping from joists or rafters. Made of durable plastic that will not scratch or mar surfaces, these hanger straps feature 1/8 In. nail holes spaced 3/4 In. apart for easy installation. They can also be cut to desired size using a knife or scissors.