Yankee Hill Machine VICTRA-12 12 Gauge Choke Tube Modified Cylinder Silver. The choke of a shotgun determines shot string only. It has no bearing on shot speed (velocity) or distance (range). That is the choke does not alter the shotgun's power it just controls how tight or spread out the pellets will be at a specific distance. Specifications for Yankee Hill Machine VICTRA-12 12 Gauge Choke Tube: Manufacturer: Yankee Hill Machine Caliber: 12 Gauge Fabric/Material: 17-4 Stainless Steel Color: Silver Finish: Stainless Diameter: 1.05 in Length: 1 in Gauge: 12 Package Contents: Yankee Hill Machine VICTRA-12 12 Gauge Choke Tube Yankee Hill Machine YHM-1241: VICTRA-12 12 Gauge Choke Tube Modified Cylinder Silver