ALL SWING HARDWARE MADE OF SUS304 FOOD GRADE STAINLESS STEEL OF 100% PERMANENT RUST, INDUSTRIAL BUILT HIGH QUALITY swingset hangers, perfect swing set brackets for all swing set products indoors or outdoors including porch swing springs ceiling or wooden mounts, gymnastics rings and hanging aerial yoga inversion trapeze swings seats SPECIAL DESIGNED: Suspension hooks support for forthward & backward 180 swing with short Hooks, Innovative and patented design EASY INSTALLATION: We've pre-drilled four 0.31" holes for bolting installation to concrete or wooden beams, cedar wood, rafters, MOUNTING BOLTS/SCREWS ARE NOT INCLUDED due to various mounting options, but you may use lag bolts diameter: 0.31 inches, height: 3.35 inches and 1/2" drill size for the concrete. SAFE AND SECURE: Heavy duty commercial quality swing hangers are rated for use by children and adults, Model 1-Model 5 : 450kg Model 6 Capacity: 800kg Swivel Hook Capacity: 300kg 100% SATISFACTION GURANTEED: If you are dissatisfied for any reason, return your order within 30-Days for full refund, we will always go above and beyond to ensure you are happy with your customer experience PLEASE NOTE:Black is electroplated paint, which will be worn out in normal use.