2" Boring Head SET 9 Pcs Carbide Boring Bars with R8 Shank 1/2'' Mill Go to amazon.com Related posts Check expert advices for boring head shank? Expert choice for boring head set FeatureBoring Head Dia: 2".Boring Head Height: 2-7/16"Boring Capacity: 10~125mm.Max. Offset: 5/8".Boring Bar Dia: 1/2". DescriptionBoring Head Dia: 2". Boring Head Height: 2-7/16" Boring Capacity: 10~125mm. Max. Offset: 5/8". Boring Bar Dia: 1/2". Cross Hole Dia: 1/2". Min. Graduation: 0.001". Bar Thread :7/8"-20 Shank: R8. Quantity of Boring Cutters: 9 PCs.