Dunno what you mean by "offset tang". But typically a tang needs to be heated & bent upward to suit the snath & users height. Grassblades need to ride pretty much flat & parallel to the ground.
Brushblades usually dont ride flat as cutting brush is more an upward scooping motion to cut stalks at diagonal rather than straight across like grass cutting.
Brushblades usually dont ride flat as cutting brush is more an upward scooping motion to cut stalks at diagonal rather than straight across like grass cutting.