Cobalt Drill Bit Set Appraisal

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10 Piece L.H. Cobalt Drill / Extractor Set

This item is a 10-piece Left Hand (L.H.) Cobalt Drill / Extractor Set, designed for removing broken bolts or screws without damaging the original threaded hole. The set is housed in a red-painted metal case with a hinged lid. The case features a metal index inside, which securely holds the various drill bits and extractors in an upright position. The index is clearly labeled with numbers 1 through 5, presumably corresponding to different sizes, although only the larger sizes are visible in detail. Below the numbered slots, there are markings indicating thread sizes such as "M 5-13," "M 7-9," "M 5-7," and imperial equivalents like "3/8-5/8." The drill bits and extractors themselves appear to be made of high-speed cobalt steel, as indicated by the case's text, which highlights their high degree of hardness and heat resistance. The tools show signs of use, including some discoloration and minor surface wear, consistent with being a used tool set. The interior of the case, particularly the printed instructions, shows noticeable dirt, smudges, and some wear, suggesting age and frequent handling. The exterior of the red case also has scuffs and paint loss in areas. Despite the wear, the overall construction appears robust and functional. This set would likely date from the mid to late 20th century, given the style of the case and the type of information presented. The craftsmanship seems solid for a utilitarian tool, with the focus on durability and functionality rather than aesthetic refinement. The legible text on the inside of the lid provides usage instructions and a 'CAUTION' regarding eye protection, which is a common feature in tool packaging.

Estimated Value

$75 - $125

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