Hilti. Install drywall more efficiently with the SD 4500-A18 Drywall Screwdriver. The cordless 18-volt lithium-ion screwdriver improves mobility when working on lifts, ladders, stilts, and scaffolds. The tool has a maximum no-load running speed of 4,200 rpm and a target runtime of 2 hours. The SD 4500-A18 is specially designed for serial drywall applications, such as exterior sheathing, drywall-to-metal, and drywall-to-wood and framing installations. The tool features single and collated screwdrivers, a silent clutch, and a high-efficiency motor to reduce noise levels. 800.879.8000. www.us.hilti.com.