Overall length of this handle is 30cm.
The fore grip can be changed to round type if you so desired.

Color Group of Reel Seat	Group A	Group B	Group C	unpainted	I.D. of the handle
Japanese Yen	JPY7301	JPY7931	JPY8929	JPY5936	15mm 10mm(front grip)

It is easy to enlarge I.D. of front grip with a round file.
-Color Group of reel seat can be found on the linked page of "Colors of Reel Seat". That is shown below of each color name.