The SKS twist on muzzle brake installs easily without gunsmithing. Muzzle brake twists on and is held in place with a set screw. Reduces SKS assault rifle recoil up to 40- 65% and muzzle climb up to 65-90%. Super easy to install SKS muzzle brake just twist on your front sight and lock on set screw. The brake reduces muzzle climb by directing gas upward through 7 gas ports. Improves your target accuracy, all steel construction. It will fit the Romanian, Russian, Norinco Chinese SKS Rifles. It will not fit the Yugoslav SKS Rifles with the launchers. Length: 3.80" long and made from steel. Includes mounting tool. Limited Lifetime Warranty.