PEM® PFC4™ self-clinching captive panel screws from PennEngineering® install permanently into stainless steel enclosures to enable easy access whenever necessary and eliminate risks associated with loose screws. The captivated screw remains reliably in place where designed in a door or panel and will not loosen, fall out, or damage internal components. Meets UL 1950 " service area access" requirements. Assorted screw lengths for most applications, for use in sheets of HRB 88 or less.