1/2"x28 Muzzle Brake for AR-15, Stainless steel. Model: MZ-02-01-SS
Jam nut and crush washer included (both stainless steel).
Dimensions: 4.2 x 2.36 x 0.98 inches
Bore diameter 0.27"
Distance to first port hole 1.18"
Includes jam nut and crush washer in stainless steel.