Specifications: Length x Width: 2 inches x 2 inches (50mm X 50 mm), Thickness: 4 mm (0.157 inches)..Screws: 5 x 20mm. Marine grade stainless steel: stainless steel provides excellent corrosion resistance and has a polished . it can withstand harsh Marine environments and is not easy to rust. Heavy duty cast construction: Thickness: 4 mm (0.157 inches). It last long even if the hinges withstand heavier doors and larger hatches. Smooth opening and closing: The large knuckle and solid pin increase strength and provide smooth operation. These hinges operate with sliding bearings, which open and close smoothly without noise. Wide application: These hinges are perfect for exterior applications and can be inserted into doors and hatches. Applicable to boat/ family/marine/yacht or , lockers, cabinets, decks, gates, toolboxes, etc. Boat Hinges Marine Grade Mounting Type:Door Mount If we're using it outdoors, and we want something that's load-bearing and , It last long even if the hinges