Carlson's Internal/External Rifled Choke made in USA for Optima Hp Beretta 12 GaugeMaterial: 304 Stainless SteelKnurled design exterior for easy installation and removalPitch: 1/35"Right-handed riflingMatt Black finishThe use of rifled chokes allows for greater accuracy by using ball ammunition and very large patterns at short distances in the case of broken ammunitionThe package includes 1 choke tubeN.B.: for assembly it may be necessary to use a choke tube wrench (not included)