Gun drilling is a deep hole drilling process that needs cutting tool to create holes in metal in diameters from 1 50. Gun Drilling Machine is ideal for the process as it is available with unique head geometry to drill deep holes by using high pressure coolant for creating holes even at extreme depths. The process of gun drilling is refined for attaining maximum performance in different domains from firearms, diesel fuel components, plastic injection molds, medical tooling, etc. Gun drilling can be completed on common CNC machines to create holes with a depth-to-diameter ratio of 20:1. In addition, it can also reach extreme ratios of 400:1.