Features: Helps reduce felt Helps reduce muzzle rise Lightweight For use with slugs. Specifications: · Anodized Black · T6 Aluminum · Compatible with 12GA Mossberg 500 series, Maverick 88.  Does not fit the 590 or Shockwave, or aftermarket slug barrels. · Length: 3.74" · Width: 1.77" · Height/Thickness: 1.25" · Exit Hole Diameter: 0.86"(22mm) · Weight: 3.3 oz