Triumph Twist Drill Co. Jobber Length Letter Drill O (.316in) HSS Black Oxide

Overview

The Triumph Twist Drill Co. Jobber Length Letter Drills are high-performance drills designed for precision drilling tasks in gunsmithing, machining, and other professional applications.

Key Features

• High-Speed Steel (HSS) construction for durability, heat resistance, and wear tolerance
• Jobber-length design for balance between reach and rigidity, helping minimize flex
• Letter sizing for a range of precise hole sizes
• Precision-ground cutting edges for clean cuts and reduced risk of wandering and chipping

Specs

• Made of High Speed Steel
• 135° self-centering point
• Finish/Coating: Black Oxide

Applications

Ideal for gunsmithing tasks such as pinhole drilling, scope mount installations, and other intricate firearm modifications, plus general workshop machining on metals, plastics, and wood.