1.high-quality 2.high- elastic 3.rigid 4.automatically adjustable 5.stable 1.PDC anchor shank coal drill bits 28mm introductionHard alloy drill bits are main tools widely used in percussion drilling. We produce Chisel bit, cross bit, three-wing bit, button bit and so on. Material: high-class alloy bitCraft: forgingApplication: the drilling of limestone, moorstone, marble; the drilling operation ...
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