Beretta USA JCW20 Wrench for 20 Gauge Shotguns with Internal Chokes
http://www.tandktactical.com/shop/082442159027-beretta-usa-jcw20-wrench-for-20-gauge-shotguns-with-internal-chokes-3425
http://www.tandktactical.com/web/image/product.template/3425/image_1920?unique=fc0019c
This choke tube wrench is for your 20 gauge.
