Dip Products was the 1st to engineer the thread adapter for the S&W 22 LR with an internal hex key over 10 yrs ago and the only one that uses stainless steel. Converts the stock 422 and 2214 series pistol threaded barrel to 1/2"x 28 so you can add your favorite accessory. The 5/16" internal Hex(Allen) key makes install/removal a breeze! Matching thread protector included. No gunsmith required.