Cardboard Tubing | McMaster-Carr
Create concrete bases for decks, piers, signs, light poles, and mailboxes. These tubes are made of specially-formulated cardboard that’s lightweight, yet holds its shape when you pour the concrete, withstands heavy pressure to prevent blowouts, and resists wet weather and soil for 24 hours. Using a utility knife or saw, cut them to the right length before pouring the concrete, and recycle the scraps.
DA: 69 PA: 32 MOZ Rank: 51