Top Positive Review for Step Drill Bit on Banggood India|Shopping India

44% OFF Drillpro HRC89 AlTiN Coating Step Drill Bit 4-20mm HSS M35 Cobalt Step Cone Drill Bit Hole Cutter ₹1,056.39 ₹1,885.55 View It

Overall:

northerndiy 08/04/2019

Great for wood or steel, not ideal for aluminium. if you use these on aluminium, expect the aluminium to bond with the coating near instantly, even at low speed/pressure.

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jono667 I would recommend adding lubricant if drilling into aluminium, and still drilling relatively slowly. aluminium is just plain annoying to drill into with these types of bits
Reply 09/05/2019

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