タイトルまたは説明

Our advantages:
1, we are factory, both price and quality are guaranteed.
2, Rich experience in drill bit
2, models complete
3, Flexible ways of doing business with our partner
4, bulk stock which ensure fast delivery
6, best after-sales service

Welcome to order and to visit our factory.

Available Size:

*0mm, *5mm, *6mm, *3mm, *5mm, *8mm(3 7/8"),
**1.6mm, **4mm, **8mm, **0mm, **7mm(5")

**0.1mm(5 1/8"), **3.3mm(5 1/4"), **9.7mm(5 1/2"),
**2.8mm(5 5/8"), **9.2mm(5 7/8")

**2.4mm(6"), **5.5mm(6 1/8"), **8.7mm(6 1/4"),
**1.9mm(6 3/8"), **5.1mm(6 1/2")

**0.5mm(7 1/2"), **3.6mm(7 5/8"), **0.0mm(7 7/8")

**2.7mm(8 3/8"), **5.9mm(8 1/2"), **2.2mm8 3/4")

**1.3(9 1/2"), **4.4(9 5/8"), **0.8(9 7/8")

**9.8(*0 5/8"), **5.3(*1 5/8")

**1.1(*2 1/4"), **6.0 (*3 5/8"), **9.2(*3 3/4")

**4.6(*4 3/4")

**1(*5"), **3.7(*5 1/2"), **6.4(*6")

**4.5(*7 1/2"), **8(*0"), **8(*2"), **9.6(*4")

**0.4(*6")

IADC CODE
**6 **7 *****7 **6 **7 **6 **7 **6 **6 **6 **7
**6 **7 **6 **7 **5 **5 **5 **5 **5 **5 **5 **5
**5 **4 **4 **4 **4 **1 **1 **1 **6 **7

**7 **7 **7 **7 **7 **7 **7 **7 **7 **7 **7 **2
**5 **5 **5 **5 **5 **5 **5 **6 **7 **6 **6 **7
**6 **6 **7 **7 **6 **6 **5