3" BORING HEAD SET 12 PCs 3/4'' CARBIDE BORING BAR WITH R8 SHANK MILL Go to amazon.com Related posts Check expert advices for boring head shank? Expert choice for boring head set Top 4 best boring head 3/4: Which is the best one in 2022? FeatureBoring Head Dia: 3".Boring Head Height: 3-5/32"Boring Capacity: 12~225mm.Max. Offset: 1".Boring Bar Dia: 3/4". DescriptionBoring Head Dia: 3". Boring Head Height: 3-5/32" Max. Offset: 1". Boring Capacity: 12~225mm. Boring Bar Dia: 3/4". Cross Hole Dia: 3/4". Min. Graduation: 0.0005". Bar Thread :1-1/2"-18 Shank: R8. Quantity of Boring Cutters: 12 PCs.