Our fixed mount inserts let you mount your suppressor on more firearms. These are HUB compatible (1 3/8-24) and available in a variety of thread pitches. This is what you need for your Nomad, Primal, and other HUB compatible silencers. Product Specifications Compatible with all HUB-equipped silencers like the Nomad Series, Sierra-5 and Primal. Finish: QPQ Black Nitride Material: 4140 HT Alloy Steel Overall Length: 0.765" Weight: 1.84 oz