Waterson is one of professional manufacturer on precise stainless steel investment casting & aluminum die casting located in Taiwan over 30 years.We are always adhering to develop innovation-based and premium quality products for world-wide customers with well awareness of brand name: Saflock, W-Lock and Waterson at competitive price. Full products line:1. Self-Locking Quick Coupler (Swivel with 360 degree in SS material)2. Stainless Steel Padlock 3. Stainless Steel Auto Door-Closer Hinge (3-in-1: combine closer/hinge/stopper)Attached is product information of hot world-wild patented item: 3-in-1-Auto Door-Closer Hinge for your reference and evaluation, or pls kindly access to our company website for further studying