HIGH QUALITY, CORROSION PROTECTION304 stainless steel rings made of high quality raw materials. No rust, corrosion resistance, high hardness.SUR &amp; Heavy duty commercial grade swing hangers are designed for use by children and adults, and designed for residential use at a 500kg rating, they are secure.EASY TO INSTALL We have pre-drilled two holes for bolting to wooden beams or concrete. Including 2 concrete anchors and 2 hex bolts. Pre-drilled concrete application expansion screws installed in just minutes.MULTIFUNCTIONBest use as wall hook for sling trainer, suspension trainer, punching bag, gym, yoga, swing indoors or outdoors.PACKAGE CONTENTS1 x durable round stainless steel eyelets with ring, 4 x anchor screws, 1 x stainless steel snap hooks.< /p>