Brand: Yankee Hill Machine. Model: HUB Direct Thread Mount System. Caliber: .45 Cal. Muzzle Thread: 5/8 x 32. Outer Thread: 1.375 x 24. Compatibility: HUB Compatible Suppressors. Material: 17-4PH Stainless Steel. Color: Black. Finish: Black Oxide. Weight: 1.7 oz. This HUB Direct Thread Mount converts HUB compatible suppressors with a 1.375-24 hub into a direct thread mounting system. Made in USA.