What is a PEM PS10 PR10 off screws N10, not to take off a screw PS10 PR10 N10 technical specificatio

What is a PEM PS10 PR10 off screws N10, not to take off a screw PS10 PR10 N10 technical specifications
PEM off by screws PS10 and nuts screw PR10 composition. Can be combined, also can be used alone. Screw for a word trough stainless steel, length are 8.38 mm, install after use, head can sink into panel inside, disassembling not easily, so called after stripping off screws. Main specifications are: PS10-44-40 PS - 632-40 PS - 832-40 PS - time never existed - 40 PS - M3-40 PS - M4-40 PS - M5-40, nut is stainless steel, the general through pressing riveting fixed in panel inside, the main specification is PR10-632 PR10-440 PR10-832 PR10 - time never existed PR10 - PR10 - M3 PR10 - M5 M4
N10 shaped like rivet nuts, pressure ventilation hole, cylinder type, have pinking, general use carbon steel material, need heat treatment. Common specifications are: N10-44-1 N10-632-1 N10-832-1 N10 - time never existed - 1 N10 - M3-1 N10 - M4-1 N10 - M5-1
不脱螺钉PS10 PR10 N10技术规范: