SL29-40-1 Standard Output Force: 40 lbs, Extended Length: 36.3", Size: 0.86" H x 0.86" W x 36.5" D Features: -Gas spring.-Made in USA. Dimensions: -Extended Length: 7.5".-Extended Length: 10".-Extended Length: 10.5".-Extended Length: 12.04".-Extended Length: 15".-Extended Length: 17.2".-Extended Length: 20".-Extended Length: 36.3".-0.1'' H x 2.12'' W x 25.5'' D.-0.65'' H x 0.65'' W x 7.75'' D.-0.65'' H x 0.65'' W x 10.25'' D.-0.68'' H x 2.12'' W x 17.5'' D.-0.68'' H x 2.12'' W x 22.5'' D.-0.68'' H x 2.12'' W x 25.5'' D.-0.71'' H x 0.71'' W x 7.75'' D.-0.81'' H x 2.12'' W x 17.12'' D.-0.81'' H x 2.12'' W x 17.5'' D.-0.81'' H x 2.12'' W x 22.5'' D.-0.81'' H x 2.12'' W x 25.5'' D.-0.86'' H x 0.86'' W x 26.5'' D.-0.86'' H x 0.86'' W x 36.5'' D.