The Yankee Hill Machine .45 CAL H.D. 3-Lug Adapter is a quick-attach mounting upgrade designed to provide added strength and longevity for your 3-Lug equipped host. This fully enclosed assembly contains a mounting interface machined from 17-4 Stainless Steel making it durable and capable of handling heavy use, including FULL AUTO. The .45 CAL H.D. 3-Lug Adapter has HUB compatible threads of 1 3/8-24". FeaturesLength: 1.5"Diameter: 1.563"Weight: 4.89 oz.Thread Size: 1 3/8x24"Calibers: .45 Cal., Rated to 300BLK sub-sonic onlyMade to the B&T standard