Carlsons Extended Turkey Choke Tubes 12 ga. Remington .640 .640" diameter;17-4 stainless steel;1.050" parallel section to produce optimum patterns;No steel shot larger than #4;Extends 1" from the end of the barreltable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 7600 Product Group Code: 7600K Product Sub Group 1: 7600K1 Inactive: No Prop65 Applies: No Prop65 Cancer Harm: No