The TT Terminator muzzle brake is available bead blasted stainless steel or KG Gunkoted Black & opened out as standard to take a maximum calibre of the .308
It is specifically manufactured to fit onto the Tikka CTR, Ruger Precision, Bergara & Savage etc rifles with a 5/8 x 24 muzzle thread & a muzzle thread shoulder no larger than 21.1mm, .830 ?

Easy DIY fit, no gun smithing required, using a locking nut to index it to the barrel.
Use a 23mm or 15/16 spanner to fit it.
A handy tip is to carefully cut up an alloy drink can to put a strip between the spanner & the brake or nut flats to help protect its finish then lube the muzzle threads before installation

TT with nut is 25mm, 0.98 ? diameter, 72 mm, 2.83 ? long, 95 grams, 3.35 oz, 5/8×24 thread.
Ports are 90 degrees to the ground to reduce disturbance. The ports are angled back away from the shooter to minimise shooter discomfort and maximise performance.

The standard through hole is for .308 & requires opening up to 0.025-0.030 over calibre size if fitted to larger calibres.
The TT performance is the same as the T3 Terminator Muzzle Brake.