L-Style L-Shafts - Silent 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 plus a set of champagne rings.