https://www.micro100.com/products/sets---indexable-boring-bars---boring---coolant-through---right-hand
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https://www.carbideanddiamondtooling.com/Coolant-Through-Turning-Toolholders-and-Boring-Bars_p_912.html
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Coolant Through Turning Toolholders and Boring Bars For Indexable Carbide Inserts Jet Steam ADCLNR ADDJNR ADDPNN ADSRNL ADSDNN ADTJNR ADTJNR