SODIAL 2PCS Hidden Hinge Stainless Steel Invisible Hinges Concealed Barrel Wooden Box Silver Color: Silver; Material: Zinc Alloy + Stainless Steel; Finish: Brushed Size: 35*45*18mm (Show as picture); Bearing strength: 5 kg/piece (Door thickness 20mm) Function: Install in wooden doors aluminum frame doors, hidden type can be installed on folding door The main body are made of zinc alloy die-cast, connecting member made of high quality 304 stainless steel. Hinge mounted in the the door leaf, opening angle of 180 degrees, after closing hinges are not exposed. After closing hinges, door gap of less than 1mm, can be used for folding doors.