Rugged Suppressors Universal Cage HUB Adapter 1.375x24/Rugged Obsidian Black. The Universal Cage Accessory allows for existing Obsidian 9mm mounting options (Booster Assemblies" Fixed Mounts" and 3-Lug Mount) to be used with the Alaskan360. The Universal Cage Accessory comes with a cage" spring" retainer and multi-tool. Pistons in a variety of thread pitches are sold separately. Specifications for Rugged Suppressors Universal Cage HUB Adapter: Manufacturer: Rugged Suppressors Color: Black Threads per Inch: 1.375x24 Features of Rugged Suppressors Universal Cage Muzzle Adapter 1/2X28 Compatible with Alaskan 360 Matte Finish Black: Includes rugged Multi-tool to ensure proper installation Package Contents: Rugged Suppressors Universal Cage HUB Adapter Rugged Suppressors CAGE002: Universal Cage HUB Adapter 1.375x24/Rugged Obsidian Black