The Winchester Invector-Plus Improved Cylinder Choke Tube is a precision-engineered accessory designed to enhance your shooting performance. This choke tube works seamlessly with back-bored barrels to deliver consistently dense and uniform shot patterns making it ideal for a variety of shooting situations. Its longer internal taper ensures fewer fliers and more reliable accuracy while the innovative design prevents gas leakage that could damage the barrel or tube. Crafted from durable 17-4 stainless steel with a sleek black finish this flush-style choke tube is built to last. Approved for use with steel lead and non-toxic shot it is optimized for 12-gauge firearms and performs best at ranges up to 30 yards. With a constriction diameter of .010 and a lightweight non-ported design this choke tube is a dependable choice for precision shooting.