Easy Heavy Lid Lift - Engineered with industrial-grade gas spring tech, this 30" 100lb gas strut delivering smooth and consistent lifting force that lets you effortlessly open 60-140lbs heavy lids like tool box, truck bed or RV beds solo, eliminating back strain and streamlining daily access Product Info - Overall length: 30.55", extended: 30.00", compressed: 17.00", 30" gas shocks fit 45-60 in wide lid and ensure perfect leverage geometry with no dead zones or over-extension risks, keeping your lids positioned at the ideal angle for loading and accessing gear without sudden slamming or obstruction All-Weather Durability - Crafted from premium Grade 45 carbon steel with mirror chrome plating and wear-resistant hydraulic oil, perform reliably in -40°F to 110°F extreme temperatures, resisting leaks and pressure loss far better than standard struts to deliver year-round lift support in Arizona heat or Minnesota snow High-Quality Material for Longevity - Built with industrial-grade 45# high-carbon steel, multi-layer chrome plating and premium anti-wear hydraulic fluid, these struts endure 50,000+ compression cycles without force loss, resisting rust and oxidation to outlast alternatives—install once and avoid costly replacements Complete 2-Pack Kit - This package includes 30-inch 100lb gas springs*2, mounting brackets*4, M8 nuts*4, Instruction manual*1, Coustomer Service card*1 (mounting screws for brackets are not included), enabling installation in under 30 minutes with standard tools to prevent lid warping and extend hinge life 1. What is the compressed length? This 30-inch 100lb gas strut features an overall length of 30.55 inches, with a center-to-center extended length of 30 inches and a center-to-center compressed length of 17 inches. The stroke rod has an M8 thread diameter, and the bolt thread diameter is M8—perfectly matched for RV bed, truck toolbox and RV side storage compartment door installation.