TCI Tricone Bit IADC627/625 Introduction The TCI (Tungsten Carbide Insert) Tricone Bit IADC627/625 is a rotary rock drilling tool engineered for medium hard formations with high compressive strength, including hard shale, limestone, sandstone and dolomite. Three rotating cones with tungsten carbide inserts provide stable penetration, balanced load distribution and reduced vibration, delivering reliable drilling performance in demanding mining, water well and exploration