GDP International Trade Co.,Ltd is a professional manufacturer of punch products and injection products, we are the largest enterprise of design, develop, sales of garage door parts, the main products line isRollers, Bearings & Pulleys, 11GA,14GA,18GA Hinges, Cable Drums, Spring fittings & Cables,Chain Hoist,Brackets & Angles,Handles ,Locks, Tracks, Springs and tubes.