Seleware Porch Swing Hanging Kit, Stainless Steel Swing Hangers With, 2 Pack Made with Permanent Antirust 304 Stainless Steel, withstand heavy use and abuse. The hanger load up to 1000lbs and the spring 400lbs each one Spring with conical design achieved a combination of strength and toughness, the elasticity is just fine, not too hard, comfortable The spring has been designed with closed end loops add safety by ensuring that swings, spring and mount stay connected. 4 screws for wood beam, easy to assemble with 2 carabiners, the sizes details is shown in figure 4 US Patent Pending. All Rights Reserved.Satisfaction Guarantee: If you are dissatisfied with any reason, return your order for 30-Days for full refund. Keeping you satisfied and providing you with the friendliest customer service is our number one goal. Better products, and the best in customer satisfaction.