Twist drills used for drilling soft metals are suitable for working horn (figure III.2). A set of 25 drills ranging from 1 to 13 mm at 0.5 mm intervals (figure III.3) is usually sufficient. The drills can be used on a hand drill (figure III.4) or a low-powered 300 to 350 W portable electric drill (figure III.5) which can be clamped to a small bench stand, as shown in figure III.6. A small parallel-jaw vice (figure III.7) is very useful for securing pieces to be drilled to the bed plate.

Figure III.2: Twist drill

Figure III.3: Set of twist drills

Figure III.4: Hand drill

Figure III.5: Portable electric drill