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The PRECISION TWIST DRILL 010012 is a high-speed steel (HSS) jobber-length drill bit built for drilling into hard surfaces where heat and mechanical stress are factors. With a 3/16-inch tip diameter and a 4-inch depth of cut, this bit is sized for the common jobber-series range used across metalworking, mechanical, and general trade applications. HSS construction gives the bit the hardness needed to cut through ferrous metals, cast iron, and other tough materials without losing edge integrity under sustained use. Licensed tradespeople and experienced mechanics reach for HSS jobber bits when consistent performance and repeatable hole quality matter on the job.
This bit fits into standard 3/8-inch or larger keyed and keyless chucks on corded or cordless drill drivers and drill presses. It suits residential and light commercial work alike, covering tasks such as drilling pilot holes, clearance holes, and through-holes in steel plate, structural members, and general fabrication work. The jobber-length format balances reach and rigidity, making it practical for both benchtop and field use.
Designed as a jobber-series HSS drill bit for use in standard drill chucks accepting 3/16-inch shank tooling, suitable for drill presses, corded drills, and cordless drill drivers used in metalworking and general trade applications.
Secure the bit fully in the chuck before operation and confirm the chuck is tightened to prevent slipping under load. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and reduce heat buildup. Reduce feed pressure when the bit is close to breaking through the material to prevent grabbing or bit deflection. Inspect the cutting edges for wear or chipping before each use and replace the bit if edge integrity is compromised.
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