It's a breakaway-style header — you can snap it to length if your board needs fewer positions, though this one ships fully loaded with all 50 pins. The 0.100" (2.54 mm) pitch and 0.100" row spacing give you a standard grid for prototyping or production, and the 0.327" (8.30 mm) mating pin length reaches deep into a receptacle.
Press-fit saves a wave-solder pass in backplane builds; solder gives you a conventional joint for rework. The square pins (Copper Alloy) are tin-plated on the post side, so the solder joint wets well.
Contact finish and mating cycles
If your application sees frequent board swaps or field-service reconnections, this plating grade is worth the premium over a tin-finish sibling. The tin post finish (39.4 µ in) is standard for solderability.
Physical and environmental
Black thermoplastic housing rated UL94 V-0 — it won't sustain flame inside an enclosure. The overall contact length is 0.608" (15.44 mm), and the insulation height sits at 0.100" (2.54 mm) above the board. No shrouding, no latch — it's a push-pull unshrouded header, so make sure the mating receptacle has its own retention if vibration is a concern.