Lee Precision Reloading Collet Dies 300 AAC Blackout Lee Precision Collet Dies 300 AAC Blackout, Silver, Small 300 AAC Blackout Collet DIE set includes a Collet DIE that uses a Collet to squeeze a mandrel Creates a precisely aligned case neck while reducing run out Dead length bullet seater DIE, shell holder, powder dipper and instructions/load data Made in USA