Rem 12ga Imp Cyl Tube .720 Description Manufactured from 1704 heat-treated stainless steel. These chokes may be used with lead shot on any constrictions. Steel shot larger than #BB should not be used in any choke tighter than full. Specifications: - Gauge: 12 - Type: Flush Mount - Choke: Improved Cylinder - Constriction: .720 (This Product does not fit the Remington Pro Bore or the Remington Spartan Models)