Offset flashlight mount which fits most full size shotguns such as Remington 870/1100, Mossberg 500/590, Benelli M4 (except SuperNova), and Winchester 1200/1300/Defender Requires mounting to barrel AND magazine tube with 1.75 inches of free mounting space in front of action with no obstructions such as a heatshield Attaches to either side of shotgun making it configurable for left or right-handed shooters Fits most tactical flashlights bodies 0.97 to 1.05 inches in diameter (flashlight is NOT included) Made in USA constructed of glass-filled polymer. ZSM-T includes the quick release thumbscrew option for easy removal of the flashlight without special tools Sizing adapters for smaller sized flashlights are sold separately and are NOT included.