The double spring mechanism in these hinges allows for smooth and controlled door movement, reducing noise and preventing slamming. This feature is particularly beneficial in environments where quiet operation is essential, such as offices, libraries, and bedrooms. The stainless steel finish adds of elegance, ensuring a pristine appearance over time. Features - Color: Black -Material:Stainless steel - Size: 12.00X7.50X1.50cm/4.72X2.95X0.59in -Stainless steel durability: constructed from stainless steel, these hinges are resistant to wear, ensuring performance. -Convenient : the double spring mechanism allows doors to close automatically, adding convenience and efficiency to your space. -Multipurpose design: suitable for a wide range of doors and windows, these hinges are ideal for both residential and commercial applications -Adjustable swing: the freeswinging design lets you adjust the door's opening and closing angle, providing flexibility for various uses -Simple installation: these hinges are designed for easy installation, making them an for diy projects and professional installations Package list: 4 x Hinges 32 x screws