For anyone working with scaffolding, these USCaster screw jacks are total workhorses! This 4-pack gives you everything you need for stable, level scaffolding on uneven surfaces. Each jack adjusts up to 18 inches, which is plenty of range for dealing with slopes, stairs, or irregular ground. The construction is solid steel with a galvanized finish that resists rust and corrosion - these things are built to last through job after job. The base plate is 4.7 inches square with mounting holes, giving you a really stable foundation that won't shift or sink. What's great is how versatile they are - use them for scaffolding obviously, but they're also perfect for leveling work tables, supporting cabinets, or any situation where you need precise height adjustment for heavy objects. Installation is straightforward - just screw them to your scaffolding frames and adjust as needed. They're one of those tools that once you have them, you'll wonder how you managed without them. Serious quality for professional results!