The R790 carbide composite drill from Dormer Tools helps manufacturers machine composite-metal alloy hybrids or stack materials. The tool was used on a drilling application involving a wing skin assembly; a customer needed to drill a stack material consisting of 10-mm-thick aluminum and 4-mm-thick carbon fiber. The drill enabled the customer to machine through-holes with no delamination or splintering of the carbon fiber and no exit burr in the aluminum. Other achievements have included machining composite stacks with a glass cloth exit face. Prototype tools consistently delivered holes with good exit quality, showing no signs of delamination, splintering, or fraying of the glass cloth.