1/2" SM shape carbide burr, single cut, cone shape, 28 degree included.
A rotary burr for deburring, weld dressing, shaping and blending in a die grinder or air tool. This one cuts 1/2" diameter with 7/8" of cut on a 1/4" shank, 2-1/4" 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.