Shars 4″ Adjustable Boring Head 0.0005 Radius + Removable R8 Shank NEW M]
Shank Size R8. Morse Taper 4 MT Tang Style Shank 1-1/2-18 Threads for Boring Head 4PCS STFCR 90 Degree 1/2″ Shank Indexable Boring Bar Set 1/2″ SCLCR Indexable Boring Bar. Shank: Drawbar thread size: 7/16-20″, Thread Size: 1.5″-18.