Question: how thick are karate boards?
Answer: Wooden boards are the most common breaking item in most martial arts, Individual boards used may range from nominal sizes as small as 6″×12″×1″ (152×305×25 mm) to as large as 12″×12″×1″ (305×305×25 mm; a board with a nominal thickness of 1″ has an actual thickness of ¾″ or 19 mm).