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Invector-Plus™ Choke Tubes for Winchester Supreme, Select, Super X2 and Super X3 shotguns.   Item # Ga Barrel Length Overall Length Length of Pull Drop at Comb Drop at Heel Nom. Weight MSRP 613050 12  Extra Full, Diameter: 0.700, Constriction: 0.040             $39.00 613051 12  Full, Diameter: 0.705, Constriction: 0.035             $39.00 613052 12  Improved Modified, Diameter: 0.715, Constriction: 0.025             $39.00 613053 12  Modified, Diameter: 0.720, Constriction: 0.020             $39.00 613054 12  Improved Cylinder, Diameter: 0.730, Constriction: 0.010             $39.00 613055 12  Skeet, Diameter: 0.735, Constriction: 0.005             $39.00 613056 12  Cylinder, Diameter: 0.740, Constriction: 0.000             $39.00 613061 20  Full, Diameter: 0.606, Constriction: 0.024             $39.00 Suggested retail prices are in U.S. dollars and are subject to change without notice.