These multi spindle drilling machines are mainly used in automobile industries for drilling holes in crankcase, cylinder head, connecting rod etc. The drill head is supplied with high pressure through coolant or external coolant depending on the application. The drilling feed is provided by a CNC table or a hydraulic table. The drills are guided in a mobile jig plate or a fixed jig plate depending on the application. The drills are mounted on to the spindle using an adjustable adaptor or a stub tool holder.