A lightweight type D-cut type upper shaft compatible with GRK4/GRK5 upper arm is now available!
This hard-anodized product is made of aluminum, making it
significantly lighter than a standard steel upper shaft. The total length of the shaft (including threads) is 34.5mm, the same as the upper shaft
used in the GRK5 front upper arm . 〇Applicable upper arm ・GRK4 standard upper arm ・GRK5 standard upper arm ・(R31S301)PM upper arm (R31S063) Lightweight shaft for GRK4/5 upper arm 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
This hard-anodized product is made of aluminum, making it
significantly lighter than a standard steel upper shaft. The total length of the shaft (including threads) is 34.5mm, the same as the upper shaft
used in the GRK5 front upper arm . 〇Applicable upper arm ・GRK4 standard upper arm ・GRK5 standard upper arm ・(R31S301)PM upper arm (R31S063) Lightweight shaft for GRK4/5 upper arm 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