Carlsons extended turkey choke 12ga.680 rem choke FEATURES-Remington Extended Turkey-Extends approximately 1" from the end of the barrel-Manufactured from 17-4 heat treated stainless steel & have a matte blue finish-Feature a 1.050" parallel section to produce the optimum pattern w/ your shotgun-Diameter: .680 Other Features: Desighned to shoot all lead & hevi-shot loads,knurled end, 25% longer parallel section to help produce very tight patterns blued non-reflective finish.