Comstock Armory HUB Steel Low Profile Suppressor Adapter Black. Currently the lightest steel Plan-B HUB adapter on the market at just 1.6 ounces. Specifications for Comstock Armory HUB Steel Low Profile Suppressor Adapter: Manufacturer: Comstock Armory Fabric/Material: Stainless Steel Color: Black Finish: Black Nitride Length: 0.3 in Weight: 1.6 oz Features of Comstock Armory HUB Steel Low Profile Suppressor Adapter Allows for the quick attachment and removal of suppressors High strength 17-4 PH stainless steel Durable black nitride finish Standard 1.375-24 threads (also known as HUB or Bravo) for use on most rifle suppressors 1-1/16" wrench flats for easy installation and removal Package Contents: Comstock Armory HUB Steel Low Profile Suppressor Adapter Comstock Armory LPABSS: HUB Steel Low Profile Suppressor Adapter Black