SwissTech 07, Long Series, Slot Drill, 8mm, 3 fl, Weldon Flat, Cobalt

12mm Diameter Slot Drill 2 Flute HSS High Speed Steel 8% Cobalt TiAlN Coated

I would not call them more fragile but you need to think about what you are asking each tooth to do: On a slot drill you have half as many teeth

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