A philips drive screw head demands a phillips screwdriver or little bit to tighten or loosen. They aspect a certain sample which can be tightened/loosened by using the correct Instrument. Vaguely resembling a pinwheel, the screw heads have a triangular socket with a few straight “wing” extensions adhering to each https://typesofwoodscrew93703.free-blogz.com/76695395/little-known-facts-about-lead-screw-thread-type