3/16" SG shape carbide burr, single cut, pointed tree.
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 3/16" shank, 2" 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.