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Drill Bit KWB 421103 3 mm Right Hand Rotation 1 pc
Drill Bit KWB 421103 is a 3 mm high-speed steel (HSS) twist drill with a 1/4" hexagon shank to ISO 1173 (E 6.3). The bit is precision ground, has a right-hand cut (rotation), a 135° tip angle and a natural (self) colour. It is supplied in a blister pack and is suitable for use with cordless drivers, drills and bit holders that accept a 1/4" hexagon drive.
The precision-ground HSS cutting edges provide consistent hole quality and dimensional accuracy. The 1/4" hex shank ensures secure seating and quick bit changes in impact drivers and bit holders. The 135° tip angle improves centring and reduces walking on metal and hard plastics. The compact 3 mm diameter is suitable for fine, precision drilling applications.
Insert the 1/4" hex shank firmly into the driver, drill chuck or bit holder. Use appropriate speed and feed for the material being drilled: lower speeds for hard metals and higher speeds for non-ferrous metals and plastics. Apply steady, moderate pressure and allow the drill bit to cut without excessive force. Periodically withdraw the bit to clear chips and reduce heat buildup. Use cutting fluid when drilling steels to prolong tool life and improve hole finish.
For best results when drilling alloyed or cast steels, use a suitable cutting lubricant and operate at reduced speeds. For small-diameter holes like 3 mm, maintain stable workpiece clamping to avoid runout and ensure accurate hole placement.
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