Upgrade your Trim Pro system with the improved Trim Pro -2 spring-loaded "universal" shell holder. The spring-loaded shell holder securely locks the case in alignment with the pilot and cutter. The "universal" shell holder will accomodate case head diameters from .250" to .625" rims. Case fit is from the 5.7x28 to the long range .338 Lapua Magnum or heavy hitting .45-70 Government. NOTE: Not for use with older Rotary Case Trimmer or Rotary Case Trimmer -2 collet style trimmers. RCBS Limited Lifetime Warranty