GRK4/5 upper arm light weight shaft [Shibata] R31S063

D-cut type aluminum upper shaft for GRK4/GRK5 upper arm.

This hard anodized product is made of aluminum.
Significant weight reduction compared to standard steel upper shaft.

The total shaft length (including the screw part) is used for the GRK5 front upper arm
Same 34.5mm as the upper shaft.

〇Applicable upper arm
・GRK4 standard upper arm
・GRK5 standard upper arm
・(R31S301) PM upper arm