05-01-2016, 11:21 AM
In the same lot as the Radi-Plane (see other thread) was this item labelled as a deburring block, made by DoAll in Chicago. DoAll makes machinists reference tools such as gauge blocks. From what I can determine, these are used to remove burrs and perfect a metal surface without removing metal. It appears to be a very finely ground granite. I noted that one of these sold on the "bay" for $60, with 30 bidders. It's only 2 x 3.5 inches. Is this the ultimate natural honing stone?