Disston Company 259516 Black Oxide Drill Bit Set 21 Piece

Product Description

The DISSTON COMPANY 259516 is a 21-piece black oxide drill bit set designed for general-purpose drilling in metal, wood, and plastic. Black oxide coating reduces friction and provides moderate corrosion resistance, extending bit life in frequent-use shop and field environments. The set covers a wide fractional range, making it practical for technicians who need one kit to handle varied bore sizes without switching between multiple cases. Licensed tradespeople across HVAC, plumbing, electrical, and general mechanical work keep sets like this on the truck for everyday drilling tasks.

This set is suited for residential and light commercial service work where a broad assortment of fractional sizes is needed on a single job. The 21 pieces span from 1/16 inches up to 1/2 inches, covering the most common drilling requirements encountered during equipment installation, bracket mounting, conduit work, and fixture rough-in. The set includes duplicate quantities of the most frequently used sizes: 1/16 inches, 5/64 inches, 3/16 inches, 1/8 inches, and 1/4 inches are each provided as two bits, reducing downtime when a size dulls or breaks mid-job.

Key Features

• Black oxide finish reduces friction and extends bit service life compared to bare high-speed steel
• 21-piece assortment covers fractional sizes from 1/16 inches through 1/2 inches
• Duplicate bits included for the five most commonly used sizes, minimizing mid-job delays
• Suitable for drilling metal, wood, and plastic in trade installation applications
• Organized set format supports tool accountability and inventory control on service vehicles

Compatibility

Designed as a general-purpose fractional drill bit set compatible with standard 3/8-inch and 1/2-inch keyed or keyless chuck corded and cordless drills used in trade applications.

Installation Notes

Drill bits should be installed with the chuck fully tightened before operation. Select the appropriate bit diameter for the fastener or hole specification required by the job. Wear appropriate eye protection when drilling into metal or masonry-adjacent materials. Bits should be inspected for wear or damage before each use and replaced when cutting edges show visible dullness or chipping.