High quality Aluminum - Black Finish
Ruger 10/22 Thread Adapter to 1/2"x28, Adapts Ruger 10/22 for 1/2"x28 Accessories
Tightens in place with 3 Black Set Screws
Allen wrench Included
Inner diameter of the hole where you put the barrel is 0.6325 inch
Machined from Steel and Knurled for a Positive Grip to Assist in Installation and Removal.
Prevents damage when a muzzle device is removed for maintenance, repair, or replacement.
Fits All .750 Diameter Barrels Threaded in 1/2"x28
Especially handy when switching muzzle devices