2Pcs Gas Struts 20 Inch 40 lbs Prop Lift Springs Rod Heavy Duty Tool Box Lid Top RV Pair by Motion18

Specifications: Opening length: 20 inches; compressed 12 inches Stroke length: 8 inches; Rod diameter: 6mm ;Suitable support weight is from 32 pounds to 45 pounds for 2 STRUTS.
Scope of application:Suitable to use on leer camper shell window, truck cap, rv side door, etc.

NOTE: If the lid weight is less than 32lbs or more than 45 pounds, please choose other pressure struts!!!
Tips used:Use a pole and bathroom scale to weigh the position where you will install the air column, usually 30%-50% away from the hinge. This will give you a good weight index, and then choose the right pillar.
Installation:The package contains 2 pillars and 4 ball studs, compatible with 10 mm ball sockets. Do not try to squeeze by hand, otherwise the pillars will be damaged.