Swivels to adjust to roof and wall angle for secure work platform For use as part of the ultra-jack aluminum scaffolding system Metaltech scaffolding tools constructed from high-grade steel The Steel Pump Jack Scaffolding System is a low-cost, easy-to-operate, safe, and portable scaffolding system built of rugged steel. Set it up to hold securely on wooden poles with a positive double locking system. Move your work platform to the desired heights with ease by engaging a convenient foot pump and then descend again with a simple hand crank. It's a productive and versatile solution that provides safe access for different types of projects. You get an ideal shingling, sheathing, insulating, painting, roofing, and siding tool for home repair, building, and main.