Home / Milling / Mill Tooling / Boring Heads / Boring Head, R-8, Diameter 4″, 1″ Boring Bars, Criterion L624R8 Boring Head, R-8, Diameter 4″, 1″ Boring Bars, Criterion L624R8$349.00 SKU: L624R8 Category: Boring Heads Description Description Criterion 4″ Boring Head, 1″ Boring Bars, R-8 Shank, DBL-204 Related products Boring Head, R-8, Bridgeport, Diameter 3″, Item #L61043B $149.00 Read more Boring Head Set, 3″, R-8 (NEW) Import, Item # GE65NBH-203S $158.95 Read more Boring Head, Straight Shank 5/8″, 1-7/8″ Diameter $59.00 Read more Boring Head, R-8, Diameter 2-1/2″, 1/2″ Bars Everede $149.00 Read more