OOPS PILOT ARBOR PK/1,Starrett,ARBHS-A19-01" /> Oops hole saw enlargement arbor It allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole This saw then acts as the pilot for the larger diameter saw that is attached to the arbor in the normal way Replaces the pilot drill in any A1, A2 or A10 type arbors