The Magnum Tools Aluminum Pump Jack System can be outfitted with this versatile work bench that can be installed as needed at any time during the job without removing the Jack from the pole or requiring any disassembly. The work bench arm allows the use of a secondary scaffold plank on the back side of the poles to act as a work surface and guard rail. This is a real time saver providing a spacious work area to ensure that you take the right tools and supplies up the scaffolding with you while promoting productivity and efficiency. Attaches to the top of the Jack. Raises and lowers with the Jack. Adjustable telescoping arm accommodates scaffold planks from 12 to 24 inches. Allows the use of safety netting.