The functions can be selected so that each operation can be carried out individually. Rotation speed of the drills can be adjusted electronically from a control panel potentiometer. Stainless steel chucks and spindle cooling by means of rotating union with special seals in the chuck area. Support table with adjustable extension guides. Laser centering: A diode laser emits a beam which passes through the drill bit for exact hole centering,  Tank with water pump for closed circuit cooling.