Kick's Buck Kicker Extended choke for buckshot is a diagonally-ported design for recoil reduction. Conical/parallel internal configuration.Easy to install and remove with your fingers. No special wrench or tool required Overall Length: 3 9/16" Ported Section Length: 1 1/2" In-barrel Length: 2 1/16" Standard Bore Size: .730" Material: 17 - 4 Stainless SteelKick's Shotgun Chokes Made In The USA