At present, there are four main types of endface designs for high-pressure DTH hammer: endface convex type, endface flat type, endface concave type and endface deep concave center type.

1、Convex end face: There are two types of drills: single convex end face and double convex end face, the latter is mainly used for DTH drills with larger diameter. . Convex DTH hammer maintain a high drilling speed in medium and hard abrasive rock, but are not suitable for drilling flat holes. Rock excavation requiring high blast hole engineering straightness.

2、Face plane type: This type of drill bit is more durable and suitable for drilling hard and extremely hard rocks, but also for drilling medium-hard rocks and soft rocks that do not require high straightness of the gunhole.

3、Concave end face: this shape of drill bit has a conical concave part on the end face, which is the slight Nucleation acts to maintain the centring performance of the drill and borehole. With better straightness. This drill has good powder drainage and fast drilling speed. It is the most commonly used DTH drill on the market today.

4、Facially deep concave centered drill: This shape of drill bit is evolved from the same type of ball tooth drill. The center portion of the drill bit end face has a deeply concave center section. It is used for nucleation in the rock drilling process to ensure straightness of the gunhole when drilling deep holes and is only suitable for drilling soft, medium to hard rock.