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.
CIR Series Low Air Pressure Down The Hole Bits
CIR Serious includes: CIR65, CIR70, CIR80, CIR 90, CIR110, CIR110W, CIR150, CIR170, CIR200W
Bit Diameter: 65mm, 68mm, 75mm, 83mm, 85mm, 90mm,110mm, 115mm, 120mm, 135mm
Face Design: Flat face, Convex face, Concave face, DGR. 
Carbide Insert: Hemi-spherical (round), Parabolic(semi-ballistic), Ballistic(conical).