The Bon Tool 14-300 Chimney Scaffold is quickly and easily erected. It will adjust by 4 in. increments to any roof up to a 15-12 pitch. This item can be nailed directly to a roof or to planks that hook over a roof ridge. It is made from high grade steel. Use wood planks to make the platform up to 5 ft. x 7 ft. in size. Use two to make a platform around a chimney.