Thread adapter 1/2"x28 UNEF suitable for Walther or Smith & Wesson cal. 22LR pistols or carbines manufactured by Walther (not suitable for Smith & Wesson MP22 compact pistol model). The connection thread pitch to the barrel is M8x0.75mm.
This thread adapter, made in parkerized steel, has a weight of 30g and allows replacing the tread protector with other muzzle devices with the same thread pitch 1/2"x28 UNEF, such as muzzle brake, flash hider, etc.