Standard cross recess, uniform force, easy to lock, not easy to slip, easier to use Deep and clear thread, no burrs, high quality carbon steel forging, better fastening effect Sharp tip with self-tapping, easy to operate, saves time and effort Corrosion resistant, can be used in humid environment, no need to worry about rust Anti-slip screw for locking, can be directly locked into wood or thin iron material, high strength, can be directly tapped, no deformation, not easy to break, Manufacturer: Jksdp