Hey, if you're dealing with a cargo door that won't stay up or needs some extra support, these gas spring struts are exactly what you need. This set comes with two struts that deliver 300 pounds of pressure each - that's some serious lifting power! The extended length is 26.375 inches from center to center of the ball socket ends, and they compress down to 16.375 inches, so they'll fit in tight spaces when not in use. The 10mm ball socket ends are pretty standard and should work with most mounting hardware. I've used these for truck bed covers, utility trailer doors, and even some heavy equipment access panels - they really make opening and closing heavy doors so much easier. The installation is straightforward if you're somewhat handy, just make sure you measure your current struts or the space you need to fill before ordering. The quality feels solid and they hold up well over time, even with frequent use. What's really nice is that they provide smooth, controlled lifting instead of that jerky motion you get with weaker struts. Whether you're replacing worn-out struts on your work vehicle or adding support to a heavy access door, these 300-pound pressure gas springs deliver the reliable performance you need. Just be careful during installation since that 300-pound force is no joke - you don't want these snapping open unexpectedly!