They are characterized by a high fast penetration in smooth formations. The diamond used in this kind of bit is natural, which reduces costs. The selection of diamond bit is made based on the rock hardness. The hardest the rock is, the smallest diamond base size is required. The most common diamond sizes used are 10, 15 and 25 stones per carats. The 40 and 60 stones per carats diamond bits are being replaced by impregnated diamond bits.

In addition, the surface set diamond bits may be with steps or pilot type. Frontal unloading diamond bits are also available.