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(1)Steel grade: J55, K55, L80, N80Q, C90, T95, P110 (2)Outside diameter: 4 1/2 ", 5"...
Sinodrills Cross Bit Taper Cross Bit Cross bit diameter: 30mm, 32mm, 35mm, 38mm, 41...
1. Rolling seal bearing structure, cylindrical roller cone in slots in the body, incr...
we are in manufacture, supply and export of the things be low Battery Battery scr...