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I have had good luck with the Bosch M42 Colbalt, Irvin also has good M42 bits (8%colbalt)

not sure these are truly professional or not, but have had no problems with these using correct pressure and quality tapping fluid on stainless or cast iron.

good luck with your search
 

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I have had good luck with the Bosch M42 Colbalt, Irvin also has good M42 bits (8%colbalt)

not sure these are truly professional or not, but have had no problems with these using correct pressure and quality tapping fluid on stainless or cast iron.

good luck with your search
Irwin industrial from Fastenall
 
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