Kolar AAA sporting tubes for 12 gauge to: 20, 28 and 410. Originally fit to a Krieghoff K80 30" barrel set. May need some fitting to work for you in your barrels whether a k80 or any other gun you may want to fit them to. Each gauge comes with 2-SKT, 1-IC, 1-M and 1-F choke. Choke wrench and insert/removal tools included. Good shooting, Rey