Ni-Slide Series 5.25"-7.5" 20 lb Black OEM Gas Spring (SL11-20-1) by. Popular replacement gas springs and mounting brackets for the aftermarket! has taken the guesswork out of deciding which SpringLift Gas Springs and Mounting Brackets to offer Marine and RV. Features Built for maximum strength and endurance Expertly crafted from the highest grade materials Designed with great care and functionality in mind Specifications Series: Ni-Slide Color: Black Closed Length: 5.25" Extended Length: 7.5 in. Shock Size: 6 x 15 mm Country of Origin: USA