MTM Shotshell Box 25 Round Original Flip-Top 20 Gauge Up To 3in.. The latch of the MTM Shotgun Shell Case has been designed to be opened easily even with gloves. The 10 gauge shells fit tight and will loosen up after a few uses. The MTM Shotshell Organize w/Flip Topr can also be used to organize some brands of 12 gauge choke tubes with a maximum length of 3.1". Specifications for MTM Shotshell Box 25 Round Original Flip-Top: Manufacturer: MTM Number of Rounds: 25 Caliber: 20 Gauge Gauge: 20 Package Contents: MTM Shotshell Box 25 Round Original Flip-Top MTM S-25-20-30: Shotshell Box 25 Round Original Flip-Top 20 Gauge Up To 3"