YHM Direct Thread Hub Adapter - 5/8 x 24 - The YHM-2189 1.375"-24 HUB Direct Thread Mount converts compatible HUB suppressors to a direct thread mounting system for a simple, secure attachment. Installation is quick and straightforward-remove the existing mounting system from the suppressor, thread the HUB Direct Thread Mount into place using a 3/4-inch open-end wrench, then thread the suppressor directly onto the barrel. The result is a reliable, streamlined mounting solution with minimal setup Made in the USA ; Length : .3in; Diameter : 1.5625in; Weight: 1.7oz.; Material : 17-4 PH SS; Finish: Black Oxide;