This tool requires only one person for bleeding all types of vehicle hydraulic cylinders. This set features durable plastic bottle with magnetic clamp, tapered fittings that fit both bleed screws and master cylinder fittings, and 3 pieces of vinyl hose. Makes it easier than ever for one person to complete the task of bleeding brake systems. Any specialty tool will help make an automotive repair or maintenance task easier, but Powerbuilt products take the concept of a big step further. Every package comes with professionally written usage instructions that take you step by step through proper tool usage.