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instructionsAluminum alloy universal joint coupling.D: single joint common joint coupling.GD: double joint common joint coupling.The internal diameters of either ends would be assembled as required.SUCH AS:G (D25L60)4to12.d 4-5-6-6.35-7-8-9-10-11-12. You can choose.I want d1=6 d2=8,(I'll ship it to you D25L60 6X8 )or d1=8 d2=10. (I'll send it to you D25L60 8X10 ).Or you can also present drawings for me to customize.This is my email address: 825111242@qq.com