36" Straight Arrow Concrete Groover Serrated 1-1/2 Depth36 inch Serrated Walking Groover is made of high quality aluminum. Designed to cut long straight 1 1 2 inch deep control joints. A special red groove cut in the top of the groover along with a sight marker helps in cutting perfectly long straight control joints. The serrated bit helps in moving aggregate in the groove more easily. Use with a clevis wood handle or adapter.