This is Carbon Crank Handle for SHIMANO reels, manufactured by Studio Composite.
This item is made 1.0mm thicker than the shorter handle RC-SC, more powerful model for a big fight.
You can use this handle without replacing SHIMANO original star-drag.
R33L EVA knobs (33mm wide) are already equipped with this handle, which is quite useful to fight against a monster fish.
The handle length is 108mm.