Sealed and moisture-proof design: aluminum alloy material is load-bearing and compression-resistant, and has a falling-tooth closed and silent design, which is sealed and waterproof and moisture-proof.Hardware accessories, diamond wrap angle: real materials, one-piece molding, strong and beautiful.Hardware double safety lock: Effectively prevent serious consequences caused by children's accidental ingestion.Flannel lining: wear-resistant, non-slip, soft to the touch, moisture-proof, and prevent vibration.