Taper Drill Rock Bits 1.Diameter: 34mm 2.Taper:22 mm, 7 Degree 3.Water Hole: ... 2 4.Body: Normal Rock Bits The Advantages Of Taper Drill Rock Bits1. Higher Quality2. With Strict Quality Control3. ... More Reasonable price4. Better After-Sales ServiceThe Taper Drill Rock Bits are made from grade hard alloy ... ,7,11,12The diameter for taper:15,19,22,24,25(mm) Drill TypeBit diamater (D)TaperWhter hole ...