Trulock Flush Mount Choke Tubes feature a stainless steel body with distinctive look, and precision machined from 17-4 heat treated stainless steel for a flush fit inside the barrel. Trulock flush choke tubes are designed to produce extra dense patterns because of their constrictions on the constriction of the throat. Using a full flush choke will produce the densest pattern in your shooting results. For a flush fit flush choke tube that will perform shot to shot you need look no further than Trulock Stainless Choke Tubes.