585-3018002 - 29-Piece Industrial Black & Gold Drill Bit Set with Index Case

Precision Engineering for Industrial Applications

The Metal Twist Drill 29 pc Bit Industrial Set is engineered to meet the rigorous demands of professional machine shops, maintenance departments, and industrial fabrication environments. At the core of this set is the premium Black and Gold oxide treatment. This dual-finish coating is not merely aesthetic; the black oxide provides essential corrosion resistance, protecting the tool during storage and use in humid environments, while the gold oxide treatment typically associated with the flutes helps to reduce friction and heat buildup during the drilling process. This combination extends the cutting life of the bit, ensuring consistent performance through mild steels and various non-ferrous metals.

Advanced Shank Geometry

One of the most critical features of this set is the intelligent shank design. Slippage within the drill chuck is a common cause of damaged bits and marred workpieces. To combat this, all bits in this set larger than 11/64" feature flatted shanks. These flats provide a positive lock with the chuck jaws, effectively transmitting high torque without spinning. Furthermore, the set is designed for versatility across different power tools; bits larger than 3/8" feature a reduced shank. This engineering choice allows operators to utilize larger diameter bits (up to 1/2") in standard 3/8" capacity drill chucks, eliminating the need for heavy-duty 1/2" drills for medium-sized holes.

Rugged Organization

The accompanying storage solution is as robust as the tools it houses. The case features a rubber over-mold construction, specifically designed to absorb impact if dropped on concrete floors—a common occurrence in busy workshops. The automatic indexing mechanism tilts the bits forward when opened, providing immediate visibility and access to the required size. For added convenience, the internal cartridges are removable, allowing a machinist to transport a specific range of bits to a machine station without carrying the entire kit. A built-in tap and drill selection chart further enhances workflow efficiency.