Anger issues

Hi everyone, I have a younger brother (almost 15) who has major issues with controlling his anger in a healthy way. He has punched 2-3 holes in the wall already and just the other night, punched the fridge which made out big glass bottle of hot sauce fall and break everywhere.

He always knows he's in biiiiiig trouble when he does that and his excuse is that he can't think before he acts. He knows that someone could get hurt.

He's tried counting to calm his down but thag doesn't work. Do you guys have any methods that work for you?