Piloted counter bores enable precise drilling of stocks with pre-existing screw holes for pillar bedding, eliminating the risk of cutter deviation. The use of interchangeable pilots enhances versatility, allowing two cutters to perform the tasks of six. This design facilitates the quick and easy addition of pillar bedding blocks. Pilots and cutters are available in popular sizes to meet a wide range of bedding requirements. 1/4 inches shank piloted aircraft counterbore with precision-engineered design for optimal material removal and enhanced alignment accuracy in aerospace applications