The T3B (black) is the standard T3 tapered back, KG Gunkoted Black & opened out for the .338 Lapua Magnum.
It is specifically manufactured to replace the 5/8 x 24 threaded factory Savage muzzle brake.
Easy DIY fit no gun smithing required, using the factory crush washer. (not supplied)
It will fit on other .308 & 338 factory rifles with the standard 5/8 x 24 thread.
The T3B is 25mm, 0.984” diameter, 69mm, 2.72” long & weighs 90 grams, 3.17 oz.
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 flats to help protect its finish then lube the crush washer faces & muzzle threads before installation