Thread type:Hex 25,Hex28,R32,,R38,R45,R51,H32,Hex35,T45,T51, Length:1000mm-6100mm ... or bitsUsually for extension rods, there are R22,R25,R28,R32,R38,T38,T45,T51,ST58,GT60 threads, and different length ... rodsRd51T51-T513660T51-T511220T51-T511525T51-T511830T51-T512435T51-T513050T51-T513660 Extension Rod R32 (1 1/4'')round Rod in factory prices