Industrial Quality Ceiling Mount, Spring Hook, Snap Swivel - Perfectly support Hammock Chairs, Porch Swings, Swinging Chairs, Punching Bags, Boxing Sandbag or hanging any other heavy object about 300kg(650lbs).Stainless steel 304 Ceiling Mount Plate securely bolts into beams, boards, concrete ceiling or any other overhead surface.4.3" long 300kg(650lbs) capacity Spring Coil - Perfect for all your heavy duty needs; helps relieve stress from impacts, will increase the lifespan of your hammock and your mounting surface. Provide a more comfortable, softer feeling. Reduce noise and vibration.The Swivel snap hook will securely clip onto your hammock or swinging chair, allows 360 degree rotation but without any entanglement or having to untwist when you spin and twist.Including one cast iron fixing buckle, one spring, one rotating ring, one connecting buckle, and two matching screws.