.457 = .707 to .71 inches
Features:
Made of steel
M18x1 threads compatible with .357 Ronin or Emperor with M18x1 endcap
Comes with black anodized Aluminum thread protector
Adapters are tight fit and have two set screws (M4) to help secure to the barrel
Very tight fit, may require some sanding inside the adapter
Uses 2mm hex keys for set screws
I would recommend putting a thin film of blue loctite on the barrel then slide on the adapter. Let it set overnight.