Home / Milling / Mill Tooling / Boring Heads / Boring Head, 4″, Flynn Mfg., Shank Boring Head, 4″, Flynn Mfg., Shank$75.00 Category: Boring Heads Description Description Flynn Mfg. 4″ boring head w/ 50 taper Related products Boring Head, Straight Shank, 3/4″, Criterion 2″, S-2, Item # L622.75A $125.00 Read more Boring Head Set, 3″, R-8 (NEW) Import, Item # GE65NBH-203S $158.95 Read more Boring Head, R-8 3″ Square, 1″ Boring Bars Armstrong $149.00 Read more Boring Head, 1/2″ Straight Shank, Diameter 2 1/2″, Everede $75.00 Read more