Patented design snaps pipe into place before attaching to joists, rafters, or studs. Made of high-impact ABS (acrylonitrile-butadiene-styrene). Nail holes on all four sides. 1/2", 3/4", and 1" will work with copper, CPVC (chlorinated polyvinyl chloride), polybutylene, or PEX (cross-linked polyethylene) tubing. 1-1/2" thru 4" will fit Schedule 30 and Schedule 40 DWV pipe. May also be used for utility use to hang bicycles, hose, tools, etc. Nails included. Packed in poly bags.