Please see additional information for thread guide. 
 
Proprietary true 2 baffle design. 90 degree radial ports intersect to create expansion chambers and forms true baffles for maximum recoil reduction with no concussion. Really stops the “Thump”. Not your average 45-70 radial muzzle brake.
 
Features
Precision machined for exceptional fit and finish.
Installs easily without strap wrenches – a tensioning key is included to ensure solid lockup.
.840′′ in diameter. Muzzle brake is back tapered for a flush fit. Only adds 1.125′′ forward of your barrel muzzle (Back tapered to .765′′ on the Ruger Marlins).
Specifications
Diameter: .840′′
Length: 1.750′′
Weight: 50g / 1.764oz
Material: 17-4 PH stainless steel for exceptional corrosion resistance and strength.