Well feasible (cordless screwdriver with speed control) and beautifully labeled, it is a great, handy helper for applications. Tearing the workpiece out of the holder. Cuts well and clean. The hex shank holds the drill securely in any chuck, you can also put the drill in a bit holder and thus extend this, which can sometimes be really helpful. The quality of the drills is completely sufficient for the increased use in the hobbymaker watchmaker area Did the step drill used a joystick to build, you do not need to drill, go through butter in the aluminum sheet. To give this drill a long life, you used cutting oil spray for cooling during drilling. And pretty good or in a different way than conventional drills. Especially with larger diameters in relatively soft materials (aluminum, plastic ...), drilling through the steps is easy to control and there is no rattling The deeply ground and spiral flute offers absolute smoothness and high cutting performance. In particular, non-breaking chips are transported clean as in a twist drill. This reduces the formation of built-up edges and cold welds on the cutting edges. The cone facilitates the retraction of drilled plates. Material: HSS 4241, Surface treatment: titanium Shaft Type: hexagonal shank sizes: 4-12 mm in 5 steps (4,6,8,10,12 mm) 4- 20 mm in 8 steps (4,6,8,10,12,14,16,18, 20 mm) 4-32 mm in 15 steps (4,6,8,10,12,14,16,18,20,22,24,26,28,30,32 mm)
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