Clean and Hidden Look: Allow you to open or close box at 0-180 degree you desired. Once installed, the lid opens smoothly and the hinges disappear completely when closed, which gives the project a much cleaner look than -mounted hinges Overall Dimension (folded): 18 mm / 0.71" (Height) x 8 mm / 0.31" (Base Dia); opening of two unfolded hinges: 4 mm / 0.16" Easy to Install: Come with 8Pcs 8 mm brass hinges,16Pcs Screws, 8mm Drill bit. Drilled a 8 mm hole and insert the hinge. The small screws can be used to secure the hinge in the hole if it is loose, just put the screws in either side of the hinge in the small slot on the side and it into the wood Material: Made of polished premium brass, these concealed hinges are sturdy and , shiny & beautiful and rust-, have strong load-bearing ability Application: These hidden hinges are intended for small, applications, perfect for jewelry boxes, small boxes, keepsake boxes, small furniture or other fine craft projects where you want the hardware hidden (Not recommended for heavy duty projects), Weight: 0.220462262 Pounds, Manufacturer: Wesafrae