Bahco Pilot Drill for all ordinary arbours except for arbours with core ejector function. high speed drill that fits all arbours for easy positioning of hole saw into workpiece. HSS pilot drill makes a hole in the work piece before the teeth of the hole saw become engaged, guiding and keeping the hole saw in correct position during the sawing operation. HSS pilot drill is designed for metal and wood applications but not in abrasive materials such as brick.