Marshalltown Company 91 6" x 2 3/4" QLT Steel Hand Groover with Wood Handle - The contractor-grade QLT Steel Hand Groovers create grooves in concrete slabs in order to control cracks. This concrete tool features a wood handle with a high mounting that provides ample finger clearance. This durable steel blade comes in many sizes as well as options for radius, groove widths, and groove depth sizes.