![]() When using reduced shank drills or any type of drill for that matter it is normal practice to open up hole step my step, for example if wanting to drill a 25mm Hole is steel plate I would use a 6mm drill open up with 10mm then 16mm and then 25mm - reduce drill speed as you get larger, and always clamp vice or metal plate securely. High production grade M35 Metric Cobalt Jobbers Length drills are made with 5 cobalt and are ground from a solid blank. These are ideally used when drilling larger holes in steel and alloy when Morse Taper drills are not available or your machinery does not VersaDrive Blacksmith Drill Bits are a premium grade 8 Cobalt drill bit with fully ground flutes, 135 Split point and Titanium coating for faster drilling. The 3 piece set includes 2 of the most common IRWIN Unibit Step Drill Bits along with the new double-flute design 4 Unibit that offers 2X FASTER DRILLING.
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