4-30mm HSS Co M35 Shank Metal Steel Step Drill Bit Hole Drill Cone Drill Bit Tool
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Scope of application:
0.1-1 mm thick Steel plate; 0.1-4 mm thick iron, aluminium, copper and other metal plates .
Use beyond this range can easily lead to drill bit damage.
It is recommended to use bench drill when the thickness of sheet metal exceeds 1 mm and the aperture exceeds 14 mm.
 
Bit cooling:
During the working process, high temperature will occur, which requires adding water or coolant to cool the bit.
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