The Amphenol ICC 87900-458HLF is a 58-position dual-row unshrouded header from the BERGSTIK II series, built on the standard 0.100" (2.54 mm) pitch that matches legacy wire-wrap and IDC footprint patterns.
The 0.100" pitch and 0.100" row spacing define a 0.100" x 0.100" grid that aligns with standard perfboard and prototype footprints — the board layout is a 58-pin rectangle, two rows of 29 positions each. The 0.720" mating contact length gives good wipe on the receptacle before the push-pull retention seats, and the 0.120" solder post length fits a standard 0.062" PCB with enough through-hole protrusion for a reliable fillet.