3/16" SC shape carbide burr, single cut, ball nosed cylinder.
A rotary burr for deburring, weld dressing, shaping and blending in a die grinder or air tool. This one cuts 3/16" diameter with 1/2" of cut on a 1/8" shank, 1-11/16" overall.
The single cut has one row of flutes, which produces long chips and cuts fast — it suits steel and harder ferrous metals and leaves a rougher surface.