4 Pack, 4-Inch x 7-Inch DWV J-Hook Pipe Holder, Supports Drain, Waste & Vent Piping From Joists, Rafters Or Studs, Accommodates Schedule 30 & 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.