This GH8792087 is a short-series (Ser. 879) interchangeable pilot counterbore with a 2-1/8 in cutting diameter and five flutes, made from high speed steel with a bright (uncoated) finish. It has a 1-1/2 in straight shank, a 9-7/8 in overall length and a 7-3/8 in shank length. The interchangeable pilot design lets the pilot be swapped to match different bolt-hole diameters, so the counterbore squares up the seat around an existing hole. The item is new, open box, and the photos show light surface oxidation on the body and shank and some marring on the shank end.