A selection of the most commonly used sizes stock up in bulk on a useful collection of wood screws and self tapping screws which can be used for a range of jobs around the home and garden. Material: Cross countersunk & Philip machine screw is made of Galvanized Iron (GI), It can be used in harsh environments such as outdoors.Nuts and Bolts have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using. Characteristic:The large computer controlled machine tools are precision manufactured to ensure the high quality of each screw.Our screw thread is very sharp, clean and accurate. And the compact thread is not easy to out of shape and slid in the process of rolling. Application: Countersunk & Philip bolts widely used in the home and office appliance, all types of machinery and equipment, car parts communication equipment, ship assembly and other machinery industry.