The Lee Precision Powder Through Expanding Die has an expanded and flared case neck with a hollow plug. This allows simultaneous charging with Auto-Disk Powder Measure or Dipper. The Powder Funnel adapter can be replaced with a Lee Auto-Disk Powder Measure for fully automatic powder charging while the case mouth is being expanded. Shellholder sold separately. Every Lee 3-Die Set includes a Powder Through Expanding Die at no extra cost.