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***** Extension Rod Spec. : Extension rods, there are R*2, R*5, R*8, R*2, R*8, T*8, T*5, T*1, ST*8, T*0 threads, and different lengths of rods are available from **0mm to ***0mm usually. Features : With the longer steel tending to be larger in diameter, conventional extension steel is characterized by a duplicate thread on each end of the steel. Hexagonal and round cross sections are available. Pls check the following conventional specifications of the extention rods SUG produced. R*2 thread extension rod length ***0 ft R*5 thread extension rod length ***0 ft R*8 thread extension rod length *0 ft R*2 thread extension rod length ***2 ft R*2 thread Guide tube length ***0 ft R*2 thread MF rod length ***4 ft T*8 thread Guide tube length ***2 ft T*8 thread MF rod length ***4 ft T*8 thread extension rod length ***2 ft T*5 thread Guide tube length ***2 ft T*5 thread MF rod length ***0 ft T*5 thread extension rod length ****0 ft T*1 thread guide tube length ***2 ft T*1 thread MF rod length ***2 ft T*1 thread extension rod length ****4 ft ST*8 thread guide tube and MF rod P.S . SUG provides the tailor made /OEM/ODM rock drilling tools to satisfying your special practical needs , we herein sincerely welcome your negotiation with us , deeply thanks to your right choise and support on us !