Hex19mm Hex25mm,Hex22mm, drill rod is used for rock drilling, blasting holes and other drilling works in the quarries, coal mines, traffic and other contractions. It works with taper drill bits and has different length for various applications, we have different length from 0.5m-6m . the taper we can procide 6° 7° 11° 12°， the material we have 95CrMo ,40SiMnCrNiMo ,and 55SiMnMo etc ,
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