General description These 10 Pcs Cupboard Door Hinges are designed for kitchen door cabinets, providing a reliable solution for smooth door operation. With a 3-inch size and a 90° opening angle, these hinges are suitable for various cabinet styles and door thicknesses. Technical specifications Size: 3 inches Opening angle: 90° Suitable door thickness: 14-22 mm Installation Determine the thickness of the door leaf before installation. For 4-inch door leaves, ensure they are within the 14-22 mm range. Mark the holes for screws and carefully screw them in, avoiding over-tightening to allow for adjustments. Position the hinge and align it straight before securing it to the side panel.