Materials: Aluminum steel This multifunctional screwdriver is for repairing glasses and watch widely Can be used to repair or screw up screws for eyeglasses, sunglass, watches, cellphones and other precise devices With a for chain, portable and easy to hanging Screwdriver only, other accessories in the picture is not included The include: Flat for head screwdriver / screwdriver / Star nut driver, Manufacturer: YUGSHNKFC