Titanium 5 port “Grizzly” Muzzle Brake Titanium 5 port “Grizzly” Muzzle Brake Grade 5 Titanium. Weight: 2.5 ounces Overall Length: 3.030 inches long Diameter: .995 with timing nut tapering to .970. Thread pitch: 5/8-24. Premium quality at a fraction of the weight of competition. Bore Diameter: Intended for cartridges as small as 223 Remington all the way up to 338-378 Weatherby! This self-timing muzzle brake has proven to provide tremendous recoil reduction while tracking in a straight linear line for optimal sight picture/alignment during the recoil impulse. Muzzle Brakes (jaoutdoors.com)