Sumitomo Electric Carbide Inc. says its GS series solid-carbide drills have an advanced substrate and wear-resistant DEX coating to allow increased feed rates and cutting speeds. The coating has alternately stacked aluminum-chromium and silicon-nitride layers to resist heat and chipping. According to the company, the point geometry reduces cutting forces and promotes stable drilling, and the wider flutes enhance chip evacuation. External coolant drills are available for making holes 2 and 4 diameters deep and through-coolant versions are for making holes 3, 5 and 8 diameters deep.