This stainless steel mounting kit is sturdy thick and anti-rust. It can be installed in the ceiling of your balcony, living room, bedroom or any other structure in the house. Just perfect for our hammock chairs and punching bags. Details:Available in multiple countsDurable, sturdy and anti-rustCan hold up to 500 lb.360-degree rotation without any tangling or twistingSnap hook will securely clip onto your hammock or swinging chair304 stainless steel/carbon steel springNote: hammock chair not includedNeed to use M10 drill bit to punch screw (sold separately)Size Information: Expansion screws: 2.5" (approximately)Plate: 3" wide x 2" long (approximately)Plate thickness: 0.12" deep (not including hook)Plate hook opening: 0.75" deepSwivel Hook: 3.5" long (approximately)Snap Hook: 3" long (approximately)Spring: 4" long (approximately)Screws: 2" longChain: 40" long