CF304 6X4 1/2 Big Bit Bronze Groover With Wood Handle100% Bronze Groover. This unique, longest wearing one piece casting wont 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