Description This Byrna Boost Adaptor conveniently allows you to use standard and readily available 12 gram CO2 cartridges, delivering an increase in shot capacity to 20 rounds per cartridge. Easy to install.PRODUCT DETAIL:12 G Adaptor Left 12 G Adaptor Right 5/64 hex key 1/8 hex key (3) M3 hex screws (2) 1/8 hex screw (3) M3 hex huts CO2 Tube