Not known Factual Statements About types of screw heads
such a screw is a non-structural fastener. It is supposed for being tightened and loosened by hand utilizing the ridged sides. Some are also built using a critical-like flat facet or fashioned for flat or Phillip head screwdrivers. This style of screw head attain recognition when Apple started out employing it in 2009 for their Mac e-book Professi