Overall length of this handle is 28cm.

Color Group of Reel Seat	Group A	Group B	Group C	unpainted	I.D. of the handle
Japanese Yen	JPY6602	JPY7232	JPY8230	JPY5237	10mm(front grip) 15mm(reel seat) 15mm(rear 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.