Corrosion Resistance, High Hardness304 stainless steel rings made of high quality raw materials. No rust, corrosion resistance, high hardness, non-toxic and pollution-free environment. On Heavy DutyCommercial-grade heavy-duty swing hangers are designed for use by children and adults, and designed for residential use at a 450kg(1 Piece) rating, they are secure. Easy to InstallWe have pre-drilled two holes for bolting to wooden or concrete beams. Including 2 concrete anchors and 2 hex bolts. Concrete application pre-drilled expansion screws installed in just minutes. Indoor and Outdoor UseFor indoor and outdoor use, applicable to concrete ceilings and wooden beams and can be used wider. Best used as a wall hook for sling trainer, suspension trainer, swivel chairs, hit bags or hang anything heavy on a hanging rack. Package Included2 x durable round stainless steel eyelets with ring, 8 x screw anchors, 2 x stainless steel snap hooks.