New Hornady Lock N Load Bullet Tube 40 S&W 10mm Fast and flexible system no box. while positioning optional light heat technology 5717504 Backpack Ryl while positioning optional light heat technology for targeted relief of the upper back and shoulder area and actually cools you down as things heat up with moisture wicking properties and ventilated AirFlow Technology 40 S&W 10mm Fast and flexible system that increases loading speed on any compatible progressive reloading press with 7 8 14 thread die stations Bullet tubes can fit 40+ bullets depending on caliber Works with standard progressive press when using the Hornady Lock N Load bullet feeder Eliminates the need for bullet feeder hopper Feeder dies are case activated meaning the bullet will only be fed upon contact with the case