TCI Tricone Bit IADC537/547 Introduction The TCI (Tungsten Carbide Insert) Tricone Bit IADC537/547 is a rotary rock drilling tool engineered for medium formation drilling in mining, water well and exploration projects. Its three rotating cones with tungsten carbide inserts deliver steady penetration and balanced load distribution across the hole bottom, reducing vibration and extending bit service life in medium shale, limestone and medium sandstone formations. Applications