Made of solid brass material, durable and sturdy to use, corrosion and wear-resistant, can be applied for a long time and not easily deformed and fading. Unique cylindrical shape design, flexible 180° opening angle, can be adjusted at will, convenient to use. Stable structure with smooth surface and edges, roller slide design, smooth rotation and no jamming, suitable for many DIY projects. Easy to install, mark the desired position and then screw the hinge into the item, not easy to fall off. Please confirm the size before purchasing them. Not recommended for vertical or load bearing application. Can be applied to upper and lower flip-cover boxes, lightweight caravan worktop, crayon boxes, table, furniture, cabinet, jewelry box hardware, wine box etc. Material: Brass Folding Total Size: 14mmx31.5mm/0.55"x1.24"(Dia.*H) Unfolding Total Size: 35.5x14x15.5mm/1.4"x0.55"x0.61"(L*W*H) Hinge Unfolding Gap Size: 7.5mm 6Pcs x Brass Barrel Hinges