MarshallTown 180W 14117 - 6 X 3 SS Walking Groover; Bit 1/2D X 1/2W X 1/4R

FEATURES:
• Stainless steel blade
• Properly shaped bit and leading edge to cut sharp groove
• Great for working in tight spaces
• Groove Size: 1/4" Radius, 1/2" Width, 1/2" Depth