At Energy Parts Solutions we use a lot if special machine tools, one of them being a Gun Drill. Gun Drills let you drill deep holes with a depth-to-diameter ratio as high as 300 to 1, through a variety of different materials. Gun barrels are of one of the most common uses of the tool, hence the name. We do not make Gun barrels at EPS, but we do make Studs up to 60” long with through holes, and many other parts that require a deep through or blind hole.