Bosch SP508 #8 Hex Shank Countersink Drill Bit Screw Pilot for Wood Plastic Composite Clean Flat Head Holes One Step Counterbore Adjustable Depth 1/4

Achieve Flawless, Flush Finishes with the Bosch Professional #8 Countersink Screw Pilot Bit

The Bosch SP508 #8 Hex Shank Countersink Drill Bit is the essential tool for woodworkers and contractors who demand precision and a professional aesthetic. Engineered to drill clean, precise pilot holes while simultaneously creating a countersink or counterbore, this bit allows for one-step operation that saves time and ensures every screw sits perfectly flush or below the surface. Whether you are working with hardwoods, softwoods, plastics, or composite materials, the specialized geometry of this bit prevents material splitting and provides a clean finish for every fastener.

Designed for durability and versatility, the SP508 features a non-slip hex shank that fits securely into both corded and cordless drills, and is particularly effective when used in a drill press for repetitive, high-accuracy tasks. The adjustable countersink depth can be easily set using a standard Allen wrench, giving you total control over the seating of your #8 screws. For extended tool life, the center drill bit is fully replaceable, ensuring you can maintain peak performance without replacing the entire assembly. This is the ultimate accessory for cabinetry, furniture building, and general deck construction.

Key Features

• Precision One-Step Operation: Drills the pilot hole, countersink, and counterbore in a single pass for maximum jobsite efficiency.
• Universal Hex Shank: Designed to reduce slippage in the chuck and fits all standard 1/4-inch quick-change systems.
• Adjustable Depth Control: Easily customize the countersink depth with an Allen wrench to match specific screw head requirements.
• Replaceable Drill Bits: Minimize downtime and cost by replacing only the center bit when worn, ensuring long-term accessory life.
• Multi-Material Versatility: Optimized for clean performance in wood, plastic, and composite materials without tearing.
• Drill Press Compatible: High-accuracy design makes it the ideal choice for stationary drill press applications.

What's Included

• (1) #8 Hex Shank Screw Pilot Countersink Bit (SP508)

Specifications

Pro-Tip: When using this bit in hardwoods like Oak or Walnut, apply a small amount of beeswax or tool lubricant to the drill flutes. This reduces friction and heat buildup, which keeps the countersink edges sharp for hundreds of additional clean cuts.