New designed tapered button bits as follows:
钎头直径
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https://www.rockdrillingtools-china.com/wp-content/uploads/2017/07/taper-button-bits-4-buttons-e1502082970756.jpg533800sdrocktoolhttps://www.rockdrillingtools-china.com/wp-content/uploads/2017/03/LOGO-300x125.jpgsdrocktool2017-08-07 13:13:442018-02-25 16:21:14New Designed Tapered Button Bits with 4 Buttons