The National Hardware Porch Swing Kit makes it easy to install and create a comfortable outdoor place to unwind with family, friends, and neighbors. Materials are Steel and Plastic. All hardware included. Porch Swing Kit includes 2 Swing Hangers, 2 - 1/2" x 4" Spring Snaps and 4 M12x80MM Lag screw with M12 Washers included. Thoughtfully designed kits offer flexibility and ease with DIY installation instructions. Digital instructions, helpful tips, images and installation videos to help you design your ultimate space. National Hardware Lifespan Limited Lifetime Warranty Safe working load of 1,000 lbs.