Shotgun clamp from ati strengthens the connection of the magazine extension to the barrel.It may also be used to mount a 1" diameter light or laser to the barrel.A sling swivel stud is included and is reversible for right or left-handed shooters.The clamp is made of a dupont extreme temperature, glass-reinforced polymer and fits all 12-gauge shotguns.Caliber: ClampCapacity: ShotgunFinish: BlackModel: ShotgunMaterial: DuPont Zytel Polymer