[13INCH GAS SPRING] VERY STRONG! YOU CAN NOT COMPRESS IT BY HAND. Fit the cover or door or lid which the SIDE LENGTH is MORE THAN 30 INCH. And your project weight is MORE THAN 53lbs for each struts. If you are not confirm the item is okay, pls Contact Us Before Purchsing. [PERFECT CABINET GAS STRUTS] Force: 298N/67Lbs Per Strut, Extended Length: 13 Inches, Compressed Length: 8.28 Inches, Bracket Holes' Size: 8 mm(diameter), 8 mm(diameter), 10 mm X 8 mm(L X W). Scope of application: 53-73lbs [HEAVY-DUTY GAS SHOCKS] Our package include 2pcs 13Inch gas lift supports, an INSTALLATION MANUAL and 4pcs L-shape metal mount plates. Keep the lid door/cabinets at 90-150 degrees. [LIFE SUPPORT IS USED FOR] 13Inch 298N Lift Supports used for RV Queen Bed, Floor Hatch, Outoor Bench, Trash Bin, Cabinets, Tool Box, Leer Tourneau Truck Bed Cover, Heavy-Duty, Camper Bed, Canopy Cover Lid Door, Roof Access for HANDS-FREE convenience. [GAS SPRING STRUTS STRONG SUPPORT] Any issues, just mail us via Amazon, and we will solve problems for you within 24Hours.