These suppressor adapters are designed to work with all CB style TBAC suppressors. We offer them in 1/2-28, 9/16-24 and 5/8-24 thread sizes and they can be used on anything 30 cal and under. They are made from 17-4 H900 heat treated stainless steel and then ionbond coated. Uses standard 3/4" wrench or socket for installation. Barrel thread size matches TBAC adapters and is in between a 2A and 3A size for best fit. We ALWAYS recommend custom fitting any suppressor adapters to the barrel to ensure there are no baffle strikes.