Manufactured to the highest quality standards the LANTAC ADC Plan B HUB mounts directly to the rear of your suppressor with a standard 1.375''X 24 TPI thread and allows attachement to any Plan B style muzzle device. Allows the use of a longer muzzle device than competitors HUBS and can be torqued to the suppressor using a standard armorers wrench. FeaturesWeight: 3.9ozThread: Plan B to 1.375''X 24 TPI