Engineered to maximize pattern density with 00 and 000 buckshot-while dealing with the excessive muzzle impulse that these larger loads create. Machined out of 17-4 heat-treated stainless, this Choke can be used with lead, steel, and Hevi-Shot loads. PLEASE NOTE: Not for use with steel shot larger than BB or faster than 1,550 FPS. Calibrated for 00 and 000 buckshot Made from heat-treated 17-4 stainless Ported to reduce muzzle jump Extends 1" from barrel Made in the USA Backed by a lifetime mfr. warranty Available in different models to fit a variety of shotguns Order today!