shank rod is one of our products ,at the side end of is Hex 22 Hex 19 Hex 25 , the other end of is R25 R28 R22 etc , it can be matched thread button bit or cross bit to drill ,the length we can provide from 0.5m-4.3m ,we used the excellent material and adapot to advanced production process to confirm the quality of the shank steel . overall normalizing process make sure theuniformity of the hardness , add the using lifetime
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