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, Automatic, 30 NMTB $149.00 Read more Boring Head, Straight Shank, 3/4″, Criterion 2″, S-2, Item # L622.75A $125.00 Read more Boring Head, R-8, Diameter 4″, 1″ Boring Bars, Criterion L624R8 $349.00 Read more Boring Head, R-8, Bridgeport, Diameter 2″, Item #L6101 $225.00 Read more