Bosch Drill Bit Set BL9IM 9 Piece Black Oxide Impact Tough (1/4 Inch Hex Shank 135 Degree Split Point Construction Metal Wood Drilling)

The Bosch BL9IM 9-Piece Impact Tough Black Oxide Drill Bit Set provides high-torque structural drilling performance in steel, aluminum, wood, and composite materials. Engineered with a specialized 135-degree no-skate split point, these bits initiate accurate, centered starts on slick surfaces without the requirement for center punching. The integrated 1/4-inch hex shanks are impact-rated to withstand the high-intensity stress of modern impact drivers, while the black oxide coating facilitates superior heat dissipation for extended tool longevity.

Best Used For:

• Metal Fabrication: Bores clean through holes in light-gauge steel, aluminum, and brass profiles for industrial mounting applications.
• Hardwood Assembly: Drills pilot holes in oak, pine, and high-density MDF without splitting or structural material deformation.
• PVC and Plastic Installation: Enables rapid, precise drilling in rigid polymer conduits and plumbing materials without melt-induced bit binding.

Key Performance & Safety Features

• No-Skate Split Point: 135-degree point angle ensures immediate surface engagement and prevents bit wandering on hardened metallic or polished surfaces.
• Impact-Rated Hex Shank: Reinforced 1/4-inch quick-change interface is engineered to resist shear stress during high-torque impact driver operation.
• Black Oxide Cooling Shield: Premium chemical coating reduces surface friction and thermal buildup to preserve cutting edge integrity during repetitive tasks.
• Rapid Debris Evacuation: Long spiral flute geometry efficiently channels metal and wood shavings away from the cutting zone to prevent clogging.
• Laser-Etched Sizing: Highly visible diameter markings on each bit body allow for instantaneous identification and workflow efficiency on busy job sites.

What's Included

• (1) 1/16 Inch Black Oxide Impact Tough Drill Bit
• (1) 3/32 Inch Black Oxide Impact Tough Drill Bit
• (1) 1/8 Inch Black Oxide Impact Tough Drill Bit
• (1) 5/32 Inch Black Oxide Impact Tough Drill Bit
• (1) 3/16 Inch Black Oxide Impact Tough Drill Bit
• (1) 7/32 Inch Black Oxide Impact Tough Drill Bit
• (1) 1/4 Inch Black Oxide Impact Tough Drill Bit
• (1) 5/16 Inch Black Oxide Impact Tough Drill Bit
• (1) 3/8 Inch Black Oxide Impact Tough Drill Bit

Technical Specifications

Pro-Tip: To significantly extend the lifespan of these bits when drilling into hard steel, apply a light cutting fluid to the drilling point and maintain a lower RPM to prevent thermal oxidation of the high-speed steel.