Drive nails for a living… got carpal tunnel syndrome? Check out the Craftsman Nextec Hammerhead Auto Hammer. The Hammerhead uses a 12-volt lithium-ion battery to drives about 2000 impacts/minute and up to a 2.5-inch nail. The hammer also has a retractable sleeve and a magnetic head so you can nail with only one hand. Only $99.99. I like it. Video of the hammer in action after the break.