China.Zhejiang Kaiyu Drilling Bits Co.,Ltd specializes in manufacturing "Kaiyu" brand mine percussion bit with 30 years manufacturing history. We has long experience on rock drilling process and the latest development of rock drills. Our products include chisel type bits, slanting forging flanged bits,pillar
gear drill bits,u-shaped pillar gear drill bits,cross style
bits,trolley bits,button bits, the head blades of compound...
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