The L.E. Wilson Steel Neck Sizer Die Bushing is made of hardened stainless steel and is designed to size the neck of a cartridge case with a .003” taper.
Bushings are marked with a size indicating the middle, but can be flipped for a tighter fit in emergency situations or for fine-tuning neck tension.
Compatible only with L.E. Wilson dies, not interchangeable with Forster or RCBS dies; selection of bushing size can be based on loaded cartridge outside neck diameter or case neck wall thickness calculations.