HWG Diamond Core Drilling Bits, Coring Bits for Geological Exploration Impregnated Diamond Core Bit Impregnated Diamond Core Bit is made with high quality synthetic diamonds, mixed evenly through a metal alloy matrix. It can drill various formations from the softest to hardest rocks. Sizes Available: Diamond core drill bits and diamond non-core drill bits A-Gauge Core Bits: A, A-RSG, AWG(AX), AWM, AWT, LTK48 B-Gauge Core Bits: B, B-RSG, B-2.400, B3, BWG(BX), BWM, BWT, LTK60,