Breek Arms Direct Thread Universal Suppressor HUB (1.375 x 24) is engineered for a straightforward, secure, and repeatable mounting solution for HUB-compatible suppressors. Constructed from rugged 17-4 Stainless Steel (H900) with a nitride finish for hardness and corrosion resistance. SPECIFICATIONS: Slim 0.70 in × 1.49 in profile adds approximately 0.25 in to overall suppressor length. Direct thread to your barrel. Universal HUB threads (1.375 × 24). Barrel threading: 5/8 × 24. Material: 17-4 Stainless. Near-zero runout. Rock-solid repeatability.