The Hornady Lock-N-Load Progressive Press Bullet Feeder Dies are specifically designed to work with the Hornady Lock-N-Load Progressive Press Bullet Feeder. The Lock-N-Load Bullet Feeder is designed to work with any progressive press with standard 7/8"-14 die threads and has been found to increase reloading speed up to 50%. These feeder dies are case activated, meaning a bullet will only be fed upon contact with the case. The collets are constructed of solid steel and are durable enough for years of reloading. Notes: Works with standard progressive press when using the Hornady Lock-N-Load Bullet FeederHornady Lock-N-Load bushing shown on the die in the picture is not includedMade In United States of Americawarning-icon WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov.