3054840 AKA 367-3056 IS A 9/16-18 MS16142/J1926 Indexable porting tool from Metcut
Uses C-187-bc or cc unhoned inserts and j-312-ff tin or j-312-fe inserts for #6 tube .375″od
Small dia .509″ spotface of .979″ 2″head length 3/4″ shank. Predrill .41x.875