Product Description material: metal size: 8mm: size when overlapped, 8*8*18mm; size when unfolded, 20.2*8*12.4mm 10mm: size when overlapped, 10*10*22.4mm; size when unfolded, 25.3*10*17mm 12mm: size when overlapped, 12*12*27mm; size when unfolded, 30.7*12*19.7mm Color: brass Quantity: 4 pieces Package content: 4*a hidden hinge 1.High-quality materials: This hinge is made of heavy-duty copper, does not rust, and is sturdy and durable. And it can be used for a long time. 2.Easy to install: The hidden hinge of the cabinet is simple to use and easy to install. This product contains 4 hinges. 3.Easy to use: These invisible hinges are very convenient to use and install. The opening angle and unique design ensure a better operating experience. 4.Application range: This hinge can be used for wooden doors, cabinet doors, light RV countertops or tables, and many DIY projects. 5.Ideal gift: You can use these barrel hinges to make your own box, as an ideal gift to your friends and family.