NOT KNOWN FACTUAL STATEMENTS ABOUT TYPES OF SCREW HEADS

this sort of screw is a non-structural fastener. It is supposed to get tightened and loosened by hand utilizing the ridged sides. Some also are produced by using a critical-like flat facet or fashioned for flat or Phillip head screwdrivers. Because the geometry just isn't recessed and comprises merely two stacked plain milling slots, a double-slot