The down-the-hole drilling is used to produce large-diameter holes in rocks, usually in the initial stage prior to blasting, but it is also used in non-blasting applications. DTH drilling are used mostly in mining quarries but can be used in a variety of other construction applications. The DTH drilling method is growing in popularity, with increases in all application segments, including blast-hole, water well, foundation, oil & gas, cooling systems and drilling for heat exchange pumps. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards.
3"High Air Pressure DTH Bits:
Bit Shanks: COP32, BR3, IR3.5,COP34,X13
COP32
Bit Diameter:85mm,90mm,95mm.100mm,105mm.
BR3
Bit Diameter: 85mm,90mm,95mm.100mm,105mm.
IR3.5,COP34
Bit Diameter: 85mm,90mm,95mm.100mm,105mm.
X13
Bit Diameter: 85mm,90mm,95mm.100mm,105mm.
Face Design: Flat face, Convex face, Concave face, DGR. 
Carbide Insert: Hemi-spherical (round), Parabolic(semi-ballistic), Ballistic(conical).