The Browning Standard Invector 12 Gauge Improved Cylinder Choke Tube is a precision-engineered accessory designed to deliver superior performance and uniform shot patterns. Crafted from durable 17-4 stainless steel it adheres to industry constriction standards ensuring reliable and consistent results. Specifically designed for Browning shotguns compatible with Standard Invector configurations this choke tube is not suitable for models marked Invector-Plus or Invector-DS. Its flush design and improved cylinder constriction make it an ideal choice for shooting at distances up to 30 yards. Approved for use with steel lead and non-toxic shot this high-quality choke tube is built to enhance your shooting accuracy and durability in the field.