The KVP Plan B Bravo 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, our mount is designed to convert HUB compatible suppressors to a Plan B mounting system. Product Specifications 7-4 Stainless Steel Material Black Nitride QPQ Finish OAL: .70" OD: 1.485" Weight: 1.8oz