Guide pilots are essential when using trepan drill bits, as they are responsible for controlling coolant flow, centering the drill bit and ensuring smooth chip removal Precise positioning When the Euroboor guide pilot is perfectly aligned, it helps center the drill bit. Coolant flow control The guide pilot cuts off the flow of oil when at rest. When drilling begins, the guide pilot is pushed into the body and allows coolant to flow into the drill bit for direct cooling and lubrication. Pushing out the material As the drill passes through the material, the guide pilot pushes out the cut material by means of a strong spring inside the body. The coolant supply is cut off.