100% Bronze Groover. This unique, longest wearing one-piece casting won’t wear out with extended use in concrete like steel groovers. Each blade is hand polished for a clean, smooth professional finish every time. This 6″ x 4-1/2″ groover features a deep bit that has a 3/8″ radius and is 3/4″ deep, 7/8″ wide. A durable tool for creating control joints in sidewalks, driveways, and other surfaces. The 4-1/2″ smooth wood provides a comfortable grip. The handle is secured directly to the casting.