It is an ideal tool for FCR carburetors.

It provides 4 tools : 6mm hex for main jets, a 3mm Allen for removing the float bowl and long-reach straight slot for pilot jets. 

The longer one is an essential tool for reaching into recessed cavities to adjust Keihin FCR carburetors.

Strong Magnetic inside to secure bits no drop.

Special design on reverse side with 1/4" Dr. bit holder to work with most bits size.

This Item has three colors for choose:

Sliver (N212377V) , Red (N212377R) and Blue (N212377U)

How to use : https://www.youtube.com/watch?v=qFDWygeKVL8