2017 36mm,38mm, 40mm,42mm drill bits
2017-10-5 · 36mm,38mm, 40mm,42mm drill bits Types. Tapered chisel bits, Tapered cross bits, Tapered button bits. Application:: Tapered drill bits are used in granite and marble quarry, gold mine, railway, tunnel, etc. for drilling. Feature: Tapered drill bits connect tapered drill steel of rock drill for drilling …
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