Kraft Tool Co.® CF305 6" x 4.5" Narrow Bronze Big Bit Groover with Wooden Handle. 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. A durable tool for creating control joints in sidewalks, driveways, and other surfaces. The handle is secured directly to the casting.