We are the Best Dth Bits to Suit Dth Hammers Fordifferent Applications.Preferred Bits for Drilling Engineers in Many Countries Because of Theirprecision Designs and Efficient Drilling During Usage.concave Bitsuitable to Drill in all Formations.cone Shaped Depression in Face Has Centering Effect Forstraighter Holes. Well Suited for Soft to Medium Hard Formations.convex Bitfast Penetration Rates, Face Design Allows for Increased Body Support for Gauge Carbide.there Aretwo Gauges and the Inner Gauge Row Helps to Protect the Outer Row from Excessive Wear.