Ask most people what equipment comes to mind for arm day and you'll hear "barbell" or "dumbbells." The T-grip bar rarely makes that list, which is a mistake if you're serious about bigger biceps and triceps.
The core advantage is angle variety. Real growth comes from stressing muscle fibers from multiple angles, not just one repeated movement pattern, and the T-grip's neutral hand position combined with cambered curl grip variations lets you actually do that within a single bar instead of switching equipment mid-workout.
That same variety carries into training methods. Palms-up grip positioning maximizes tricep stimulation on pressing work; hammer curl variations shift the stress pattern on biceps compared to a standard curl. It also makes supersets and drop sets easier to execute cleanly — both of which raise training intensity and are a big part of what actually drives muscle growth when progress stalls.
And the same neutral grip that reduces injury risk elsewhere applies here: keeping the body in a natural position through curls and presses means less unnecessary stress on the tendons, ligaments, and joints that would otherwise cap how hard you can push the workout.
If arm day has plateaued, this is worth trying before adding more volume to the same movements you've already been doing.