Which way the drill can be used?. Bullet perforation.
Design and principle of operation of hydraulic torches. One-piece (integral) and compound drills (rods) are used for drilling boreholes. The first bit is forged at the same time with the body of the drill, which allows you to drill blanks with a reduced diameter of 24-38 mm, the second bits are removable, attached to the rod cone or thread connection. […]
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