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King-Long Top Hammer Rock Drilling Tools:
Cross Inserts Tapered Bits Diameters: 32mm, 34mm, 38mm, 40mm, 42mm, 50mm,55, 60mm 65mm.
Application of Cross Insert Bits: Mining, Tunneling, Construction Project etc. Especially good at Coal Mining Drilling Business.
Advantages of King-Long Cross Bits:
A: High Effective Penetration Speed.
B: Easy Operation for all Operators.
C: Production is fast and simple, lower labor cost and cheaper price for market users.
D: Very Adaptable for Various Rock Informations.
Photograph of Our Cross Bits with Small Hole Drilling Diameters
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http://www.kinglongrockdrillingtools.com/