[Good quality] Cold rolled steel construction and nickel plating treatment make the hinges strong and durable. Anti-corrosion and rust resistant. 【Easy Installation】 Hidden hinges can be installed quickly with minimal tools. No need to alter the cabinet door. Excellent Closing Force】. Built-in spring provides enough tension to help close and hold the door quite well (90 degrees). 【Wide Application】 Great way to update any frameless cabinet, especially effective for 0.6-1 inch doors. 【Complete Set】 2 concealed hinges with 16 screws., Manufacturer: Shun Yingtong