Carlsons Delta Waterfowl Choke Beretta/ Benelli Mobil MR & LR 20ga. 2 pk. Manufactured from 1704 stainless steel;25 percent longer parallel section in the choke;Knurled on the end for quick and easy removal;Backed by Carlson&';s lifetime warranty;Steel shot may be used through these chokes;Available in sizes: Mobil 12ga. 2pk, Mobil LR 12ga., Mobil MR & LR 20ga. 2pk., Mobil Mr 12ga., Mobil Set C, M, LR 12ga.table.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