The 304 stainless steel ring is made of high-quality raw materials, which is anti-rust, corrosion-resistant, high hardness, non-toxic, non-polluting and environmentally friendly. We pre-drilled two holes for bolting to wood beams or concrete. Includes 2 concrete anchors and 2 hex bolts and installs in minutes. What you get: swing hanger with 2 concrete anchors and 2 hex bolts, M8 snap hook. The innovative design makes the use more flexible and the scope of application wider. Heavy duty commercial grade swing hanger for kids and adults, designed for residential use, rated at 450kg, safe to use and built to last. Great for hammock swings, porch swings, rocking chairs, sandbags, or for hanging any other heavy objects with top attachments. Includes gymnastic ring ceiling bracket.