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Boron steel ???
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01-01-2017, 02:52 AM
neilb
MetalShaper of the Month March 2019
Join Date: Aug 2013
Location: Melbourne OZ
Posts: 672
hi stevepcs, there is a specialist spot weld drill to drill them out in boron and uhss steel. they are about 80$ aud from memory they are 3 flute instead of the normal 2 flute drill bits
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