Moly drill bits work well with mild steel. Cobalt bits are expensive and best choice for the abuse common in farm shops, but…drill bits by definition are “consumable items.” The differences ...

Common materials of construction include high-speed steel, cobalt, carbide, and diamond PCD ... GOST 26474 - Diamond and Extra-Hard Composite Material Drill Bits and Core Bits. Types and Main ...

whereas cobalt is typically used for harder materials like cast iron or stainless steel. Tungsten-carbide tipped (TCT) and ...