Side profile view of the Bosch HDG4 4-inch diamond hole saw, featuring a black steel body with the white Bosch logo, side ejection slots, and a vacuum-brazed diamond grit cutting edge.
Action shot of a professional using a cordless drill equipped with the Bosch HDG4 diamond hole saw to wet-cut a hole in a ceramic tile resting on a white bucket, demonstrating the tool's use for bathroom plumbing installations.
Side profile view of the Bosch HDG4 4-inch diamond hole saw, featuring a black steel body with the white Bosch logo, side ejection slots, and a vacuum-brazed diamond grit cutting edge.
Action shot of a professional using a cordless drill equipped with the Bosch HDG4 diamond hole saw to wet-cut a hole in a ceramic tile resting on a white bucket, demonstrating the tool's use for bathroom plumbing installations.
BOSCH

Bosch HDG4 4 Inch Diamond Grit Hole Saw Vacuum Brazed for Granite Porcelain Tile and Glass Wet Cutting Professional Masonry Tool

Only 1 left
SKU: HDG4
$57.77 USD

Description

Master the Hardest Materials with the Bosch HDG4 4-Inch Vacuum-Brazed Diamond Hole Saw

Unlock professional-grade performance in masonry and stone applications with the Bosch HDG4 4-Inch Diamond Hole Saw. Engineered with premium vacuum-brazed diamond grit, this cutter is designed to bite through the toughest materials—including porcelain, granite, slate, glass, and ceramic tile—where standard bi-metal saws fail. The vacuum-brazing technology fuses the diamond particles directly to the steel edge, ensuring the grit remains intact during rigorous use, cutting faster and lasting significantly longer than traditional diamond-coated bits.

Built for efficiency, the HDG4 features segmented teeth that actively reduce heat buildup and clear debris, ensuring clean, precise cuts every time. It is fully compatible with the Bosch Quick Change universal hole saw system, allowing you to swap between sizes in seconds without additional tools. Designed for wet sawing applications, this accessory ensures safety and longevity when paired with a GFCI-protected circuit. Whether you are installing plumbing fixtures in granite countertops or running conduit through porcelain tile, this hole saw delivers the durability and speed required for the job.

Note: Mandrel and pilot bit are sold separately.

Key Features

  • Vacuum-Brazed Diamond Technology: Superior grit retention cuts faster and lasts longer in hard abrasive materials.
  • Segmented Tooth Design: Reduces friction and heat while effectively clearing debris for smoother operation.
  • Quick Change Compatibility: Works with the Bosch universal system for rapid size swaps (mandrel required).
  • Easy Plug Removal: Side slots allow for quick ejection of material cores to keep you working efficiently.
  • Hard Material Specialist: Optimized for drilling granite, porcelain, marble, slate, glass, and ceramic tile.
  • Wet Cut Design: Engineered for use with water cooling to extend life and maintain cut quality.

What's Included:

  • (1) 4-Inch Diamond Grit Hole Saw (Model HDG4)

Specifications

Model Number HDG4
Hole Saw Diameter 4 In.
Cutting Depth 1-1/2 In.
Blade Material Vacuum-Brazed Diamond Grit
Arbor Included No (Non-Arbored)
Application Material Granite, Porcelain, Tile, Glass
Tool Compatibility Standard Drill/Drivers (Wet Mode)
Wet/Dry Usage Wet Only
Recommended Speed Variable (Low RPM Recommended)
UNSPSC 27112800
Pro-Tip: To start a hole without a pilot bit, hold the drill at a 45-degree angle to the surface. creating a "smile" groove. Once the groove is established, slowly bring the drill upright to 90 degrees while applying water to keep the cut cool and clean.