The Shotgun Classic Kit is ideal for your 12/20 gauge shotgun. The kit includes: 32″ Kleen-Bore 3-piece aluminum rod (which accepts 10,12,16,20,28 & 410 accessories and 5/16-27 American standard threads); double end nylon bristle gun brush; 12/20 GA phosphor bronze bore brush; slotted shotgun patch holder; 2 oz BreakFree CLP; silicone cloth; shotgun cotton cleaning patches all in a reusable carrying/storage case.