Lee's Collet Die uses a Collet to squeeze a Mandrel, creating a precisely aligned case neck while reducing run out. Sizes just the neck and requires no lubrication.
Specifications:

Type	Collet Neck Sizing Rifle Die
Caliber	243 Winchester
Die Type
Die Series	Collet
In Set	1
Metal Type
Adapt to Mfg
Shell Holder
Shell Holder Cap