L-Style L-Shafts Gradient – N9 – Natural Nine – Straight – Locked. Japanese material manufacturing technology. Precision moulded, for accurate 2ba thread form. The flights work best when using the Shell Lock Rings or the Champagne Rings as these help lock everything together to create a very strong hold. Measurement is taken from the top of the thread to the bottom of the slits. Each pack contains 3 shafts. L-Style – L-Shafts Gradient – N9 – Locked Straight – Forest GreenL-Style L-Shafts Gradient – N9 – Natural Nine – Straight – Locked. Japanese material manufacturing technology. Precision moulded, for accurate 2ba thread form. The flights work best when using the Shell Lock Rings or the Champagne Rings as these help lock everything together to create a very strong hold. Measurement is taken from the top of the thread to the bottom of the slits. Each pack contains 3 shafts.L-Style L-Shafts Gradient – N9 – Natural Nine – Straight – Locked. Japanese material manufacturing technology. Precision moulded, for accurate 2ba thread form. The flights work best when using the Shell Lock Rings or the Champagne Rings as these help lock everything together to create a very strong hold. Measurement is taken from the top of the thread to the bottom of the slits. Each pack contains 3 shafts.