L.E. Wilson, Inc. steel neck sizer die bushing is made of hardened stainless steel and comes in .001” increments.
The bushing has a .003” taper, and can be flipped to achieve a tighter sizing in emergency situations or for fine-tuning.
These bushings are not interchangeable with Forster or RCBS dies, and proper size selection involves specific measurements of the cartridge or case neck.