Made of high quality stainless steel, sturdy and wear resistant, durable to use. 12 kinds of small screws and nuts assortment kit, M1 M1.2 M1.4 M1.6 is available. Models quantuty: M1.2 M1.4 M1*3.6 M1.2*3.6 M1.4*2.4 M1.4*2.6 M1.4*2.8 M1.4*3.0 M1.4*4.0 M1.4*4.5 M1.4*1.6 M1.6*4.5. Total 600pcs and you can use them for quite a long time. Well packed and assorted in a plastic box, don't have to worry about damage or disorder. Good assortment of screws. The box design is nice and easy to take right screw out. Great for watches,clocks, glasses, electronics or anything else repair that requires small screws. A handy accessory to your tool kit.