1. Corrosion Resistance, High Hardness 304 stainless steel rings made of high quality raw materials. No rust, corrosion resistance, high hardness, non-toxic and pollution-free environment.^ 2. Safe & Sturdy Heavy duty commercial grade swing hooks are designed for use by children and adults, and designed for residential use at a rating of 450kg (1 Pieces), they are secure.^ 3. Easy to install We have pre-drilled two holes for bolting to wood or concrete beams. Including 2 concrete anchors and 2 hex bolts. Concrete application pre-drilled expansion screws installed in minutes.^ 4. Indoor and outdoor use For indoor and outdoor use, applicable to concrete ceilings and wooden beams, and can be used more widely. Optimal use as a wall hook for sling trainer, suspension trainer, rotate chairs, hit bags or hang any heavy object on a hanging rack.^ 5. Package contents 2 x durable round stainless steel jumpers with ring, 8 x anchor screws, 2 x stainless steel snap hooks.^