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This high speed taper drill has two-flute cutting edges which drill and enlarge the holes in ferrous and non-ferrous metals up to 2mm thick. A 1/4 in hexagonal shank enables use in both power drills or screwdrivers. Size Range: 3-14mm.Additional Information:• Min. Size (mm): 3• Max. Size (mm): 14• Shank (mm): 6.5