Stainless Steel 2" long x .920" diameter (bull barrel)
Aluminum 2" long x .870" diameter
The Kidd .22 muzzle brake can be used on any .22 caliber rifle or pistol with 1/2" -28 threads. The purpose of a muzzle brake is to reduce the felt recoil of the rifle. A .22 caliber shot doesn't generate a great deal of recoil for the shooter but this item will still decrease it slightly. It also adds more weight to the muzzle end and looks great!
Educational note: a flash suppressor is intended to hide the flash from the target and a compensator or muzzle brake is meant to direct the gases to reduce the upward climb of the firearm.