HMT CarbideMax 200 2 Piece Broach Cutter Pilot Pin 18-50mm, Pk2When using the 2 part pilot pin and drilling material greater than 50mm thick, when the pilot pin reaches the extent to which it can retract inside the Magnet Drill arbor, the bottom section of the pilot can be removed to allow the hole to be completed without removing the pilot pin from the cutter. A flat side is ground onto the pilot pin to allow centre feed coolant to pass from the arbor and be directed into the centre of the broaching cut 7. 98 x