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1. The main products are cutting drills of high speed twist drill, all-grinded drill, finished drill, prick handle drill, carpenter drill, civil l engineering drill and so on.
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2. The design is about reconstructing the ordinary drill to a multiple drill. The ordinary drill is a single drill.
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3. The design is about reconstructing the ordinary drill to a multiple drill. The ordinary drill is a single drill.
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4. By forming a thin film around the drill bit, drill assembly, thus preventing the balling of the drill bit and drill pipe, the ROP accelerators rendered the mud lubricity and in cre��
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5. Introduced about the principles and features of ZD150 type big hole drill and discussed the main facts for influence on the highly quality of the drill hole.
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