The KVP Plan B Alpha 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 1.125 x28 thread pattern, our mount is designed to convert HUB compatible suppressors to a Plan B mounting system. Product Features 17-4 Stainless Steel Material Black Nitride QPQ Finish Product Specifications OAL: .70 OD: 1.375 Weight: 1.3oz