TSP Core Bit The TSP Core Bit, also known as a Thermally Stable Polycrystalline Diamond Core Bit, is designed for geological core drilling, mineral exploration, geotechnical investigation and rock sampling. Thermally stable polycrystalline diamond cutters are positioned around the bit crown. During rotary drilling, the exposed cutting elements cut and shear the rock while the waterways carry drilling fluid across the bit face to cool the crown and remove cuttings. Compared