Special concave hole is designed to hold the screws properly according to the shape of the screws for customer ' s easily and efficient Fix quickly and conveniently without the hassle of going to a repair shop A great tool kit for fixing your favorite sun glasses or other eye wear items It can serve as a handy tool for personal needs or a your loved ' s favorite glasses or watch repair needs stainless steel, anti-rust, can ' t easily out of shape and will last of use, Manufacturer: SHANGYAKEJI