The cremator series has no size or speed restrictions with steel shot in any of the three constrictions.You also get all the benefits of an extended choke tube, including a 25% longer parallel section for tighter and more dense patterns, wrench-less installation, quick removal and helps with muzzle protection.They are offered in your choice of ported or non-ported configurations.Carlson's cremator series choke tubes are made in the u.S.A., and are precision-machined from heat-treated 17-4 stainless steel.Gauge: 12 GaugeConstriction Type: Mid-RangeConfiguration: Benelli/BerettaFinish: BluedChokes Included: 2Material: 17-4 Stainless Steel