Wood barrier

Five fen below [distal to] and 5 fen to the inner [ulnar] side of the center of the horizontal line of the wrist crease, directly at (on the same line as) the junction between the metacarpal bones of the middle and ring fingers. The point is 5 fen below [distal to] and 5 fen to the inner [ulnar] side of the horizontal line of the wrist.

Same as location