The Kaw Valley Precision Direct Thread Hub Mount is built to withstand the toughest conditions. Each mount is made from 17-4 H900 stainless steel and finished with a black nitride coating. With a 1.375"x24 thread pattern, this mount is designed to convert HUB compatible suppressors to a direct thread mounting system. FeaturesMade from 17-4 H900 stainless steel and finished with a black nitride coating1.375"x24 thread pattern, mount is designed to convert HUB compatible suppressors to a direct thread mounting system