4 Pack, 2" x 7" DWV J-Hook Pipe Holder, Supports Drain, Waste And Vent Piping From Joists, Rafters Or Studs, Accomodates Schedule 30 And 40 DWV Pipe, Design Snaps Pipe Into Place Before Attaching To Joists, Rafters Or Studs, Nail Holes On All 4 Sides, Nails Included, Poly Bag.