Self-drilling screws can fasten metal to metal, wood to metal due to its various specialized applications. Self-drilling screws are ideal for HVAC applications, cladding, metal roofing, steel framing and other general construction tasks.It’s easy to install self-drilling screws. Different types of self-drilling screws are suitable for different materials, such as wood, metal or plastic. Self-drilling screws can work well with light low-density materials. Self-drilling screws is a popular choice for many applications. We use high-precision cutting technology. The threads are very precise and clean. The deep and clear threads can penetrate the sheet metal to ensure a firm fixiing easily.PL: PLAIN YZ: YELLOW ZINC ZN: ZINC KP: BLACK PHOSPHATED BP: GREY PHOSPHATED BZ: BLACK ZINC BO: BLACK OXIDE DC: DACROTIZED RS: RUSPERT XY: XYLAN Head Styles Head Recess Threads Points