Sumitomo Electric has listed ultra-hard drills and supports high-efficiency machining through additional oil holes.

Figure: "Super Multi Drill HGS type" with additional oil holes and support for MQL processing. Sumitomo Electric Industries has launched the "Super Multi Drill HGS" (pictured) with a general-purpose super-hard bit with oil holes. The drill has added oil holes to the "Super Multi Drill GS" listed in Sumitomo Electric Hard Metal (Headquarters: Itami City) in 2008 to support internal oil supply and MQL (Minimal Quantity Lubrication) processing (see this site report). . Holes with L/D (machining depth/machining diameter) of 3, 5, and 8 can be machined.

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