The Carlson's Choke Tubes 38030 TSS Turkey Invector Stevens 301 410 Gauge Turkey 1.5" Flush Steel is engineered to deliver a superior pattern with Federal Premium Heavyweight TSS Turkey loads while performing well with other smaller size turkey loads ranging from 7 to 9, aiming to place the maximum shot in a 10" circle at 40 yards. Crafted in the United States with high-quality steel and tight tolerances, this flush-mount choke tube is designed to maximize performance across your shotgun, offering dependable service for a lifetime. Its precision bore and durable construction ensure consistent patterns and reliable performance when targeting gobblers at a variety of ranges, making it a trusted choice for turkey hunts and field trials alike. The design is compatible with Invector-style receivers and is built to withstand the demanding conditions of turkey hunting, while the black finish and robust fit reinforce long-term durability. Note that steel shot larger than #4 should not be used in Carlson's Turkey Choke Tubes, ensuring safety and optimal patterning.