Name: PDC drill bit reaming Model: reaming drill Specifications: Φ65-Φ450 applicable formations: f≤10 Purpose: drilling gas drainage hole, water discharge holes, grouting holes, holes and other geological exploration. Features: For a large diameter holes, two reaming. Can reduce the cross-sectional area of ??the cutting edge of rock drill hole, the solution of large diameter drill footage in slow hard rock in question.