Storage for two sets of crimping dies in the handles. No tools needed to change dies. Precision mechanism for smooth crimping cycles. Hardened mechanism components for long term durability. Cushioned handles for comfort. Full cycle mechanism assures complete crimps, but tool can be opened mid-cycle if necessary. Comes with three crimping die sets: 22-10 AWG Insulated Terminals, 22-10 AWG Uninsulated Terminals and 26-8 AWG Wire Ferrules.