Stop pointing your elbow skyward when turning a screw. The most comfortable driver ever! Designed so your arm can be in a more natural position by having the driver head swivel and pivot to always fit securely in the palm of your hand. Ergonomic design eliminates wrist and elbow fatigue. Blades are held in place with a magnet for easy switching. Steel and brass construction. Uses standard replacement driver blades. Includes standard screwdriver blade. 4-5/8″ long. US Patent #6,145,982.