No cooling is required for extremely hard porcelain tiles with a Mohs/Ritz hardness of 9 and for glass and porcelain. This product is not suitable for percussion drilling and has no tapping problems. It features a centre point for precise hole placement, a patented carbide insert and a conically embedded cutting insert for increased break resistance and stability. The shortened neck reduces torsional forces, minimises bounce and vibration and increases durability. The unique non-slip shank prevents rotation in the drill chuck and ensures optimum torque transmission. The set includes a professional concrete drill bit for reworking after drilling tiles in masonry.