Profile: Quicksilver Engineering manufactures safety products, roofing equipment, custom machines and electromechanical devices. Our products include speedstand warning line systems, speedstand for metal roofs, replacement flaglines and guardrails. Our warning line system consists of a flagged line that fences off a work area and is fastened to a series of stands that are set up near the edges of the roof. Our tarp roller system is ideal for roofing, drywall, demolition, general hauling, insulation and excavation.