Drill Bit Set in Metal Index Case

This item is a set of drill bits housed in a durable metal index case. The drill bits appear to be made from high-speed steel (HSS) or a similar alloy, indicated by their dark, possibly titanium nitride (TiN) coated or black oxide finish, which provides increased hardness and reduced friction. Each bit features a helical flute design, characteristic of twist drills, with sharp cutting edges. There are at least eight discernible drill bits of varying diameters, decreasing in size from right to left. The case itself is rectangular, likely made of steel or aluminum, with a hinged lid. The interior of the case is organized with individual slots for each bit, and clearly labeled with their respective fractional and decimal sizes. Visible labels include '13/32 (.406)', '27/64 (.422)', '7/16 (.437)', '29/64 (.453)', '15/32 (.469)', '31/64 (.484)', and '1/2 (.500)'. The numbers '25' are also visible in one location, possibly indicating a count or specific size. The overall condition shows signs of use, with some scratches and scuffs on the metal case, suggesting an older, well-utilized set. The drill bits themselves exhibit some minor wear and discoloration, but generally appear to be in functional condition. The absence of prominent maker's marks on the visible parts of the bits or case makes it difficult to ascertain a specific manufacturer or precise manufacturing details, though these types of sets are common across various tool manufacturers. The design implies a practical, utilitarian purpose.

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