Marshalltown 4.375-in x 6-in Zinc Concrete GrooverMade from high quality long wearing zinc, harder than bronze Finely finished to cut sharp clean grooves Shaped to eliminate concrete catching corners Dimensionally very consistent Smooth finish allows for easier clean up Resilient DuraSoft handle provides a soft feel, reduces fatigue, and offers excellent durability Bit size: 1 4 in radius, 3 8 in width, 1 in depth