Crafted from alloys,it have good strength and resistance.Durability and can be used for long trems. screws is stored in a clear and storage box with compartments,stored separately,well organized,easy to carry and find. Easy to use: thread of screw is clear and,and force is uniform and not slip off easily,and the stability is good. screws is widely used at indoor project,like eyeglasses,watches,clock,computer,camera or anything else that requires small screws. the product is a very small screw/ screw/ screw.Please check the size before purchasing.