Titanium Nitride (TiN) Coated Drill Bit Set in Plastic Case

This item is a set of drill bits presented in a portable, hinged plastic case. The case itself is black plastic with bright orange inserts designed to securely hold the drill bits. There appear to be two main sections to the case, each holding a different selection of bits. One section, on the left, holds smaller diameter bits, while the right section holds larger ones. The drill bits themselves exhibit a brass or bronze coloration, suggesting a titanium nitride (TiN) coating, which is common for increased hardness and wear resistance. Some of the larger bits show significant wear, particularly on the shanks and flutes, with discoloration and loss of the golden coating, revealing the bare metal underneath. This indicates heavy use. The smaller bits on the left appear to be in slightly better condition but also show signs of regular use. The orange inserts have molded slots for each bit, and one of the inserts in the right section features a 'CONVERSION CHART' printed on it, likely detailing drill bit sizes or material compatibility. The case itself shows signs of age and use, with dust, grime, and minor scuffs visible on its exterior. This set appears to be a standard industrial or professional-grade drill bit set, likely intended for drilling into various materials. The craftsmanship is functional, designed for utility and transport. The age is difficult to pinpoint precisely without maker's marks, but the style of the case and the presence of a conversion chart suggest a modern manufacturing period, likely within the last 20-30 years.