Mixed Set of Industrial Drill Bits in Plastic Storage Case

This item consists of a diverse collection of industrial-grade twist drill bits and machining tools housed within a black molded plastic utility box. The set includes various sizes and types of bits, likely made from high-speed steel (HSS) or cobalt alloy, characterized by their dark grey and metallic finishes. Notable features include standard jobber length bits, several reduced-shank bits for larger hole boring, and what appears to be a specialized center punch or scribe with a knurled grip. Inside the main compartment rests a secondary, smaller grey plastic index case, likely containing precision micro-bits. The tools show signs of heavy use, with visible surface oxidation, grease residue, and minor dulling of the cutting edges. The larger bits exhibit varied fluting patterns and shank configurations, suggesting they were gathered over time rather than purchased as a single uniform set. The black outer case is constructed of durable polycarbonate with a integrated handle mold and a plastic latch mechanism, showing topical abrasions and dust consistent with a workshop environment. No specific manufacturer marks are clearly legible on the shanks in the provided image, but the construction indicates mid-to-late 20th-century professional-grade utility tools.