Use the Yonico 16170 router bit to create a 1.65″ Radius concave bowl or crater-like indents at 1-3/4″ Diameter across and 1/4″ Deep. May be plunged deeper to create side walls or shallower for a smaller diameter. Blades meet in the center allowing true vertical plunging. Cnc compatible. 1/16″ Thick carbide.