Quick view Yankee Hill Machine Yankee Hill Hub, Yhm 2189-24 Hub Direct Thread Mount, 5/8"-24 $89.95 $74.75 This 1.375"-24 hub direct thread mount will convert hub compatible suppressors to a direct thread mounting system.To install, simply remove your existing mount mechanism from your suppressor and thread on our hub direct thread mount using a 3/4" open end... Compare Add to Cart