Diablo Pilot Drill Bit DHS4BITCT 4 Inch Carbide Tipped (1/4 Hex Shank 9/32 Diameter Snap Lock Plus Mandrel Fiber Cement Ceramic Deep Cut Hole Saw)

Diablo DHS4BITCT 4-Inch Carbide Tipped Pilot Drill Bit for Snap-Lock Plus Mandrels

The Diablo DHS4BITCT is a 4-inch overall length by 9/32-inch diameter carbide-tipped pilot drill bit engineered with a 1/4-inch hex shank for guided deep-cut hole saw operations in highly abrasive materials. Built with high-density tungsten carbide tooth tips that withstand intense friction wear from fiber cement board, wall tile, and ceramic paneling, this specialized pilot bit integrates directly into Diablo Snap-Lock Plus mandrel assemblies. Featuring a high-speed tip geometry that maintains tracking accuracy and prevents hole saw cup walking, this 4-inch bit gives siding installers, plumbers, and electricians clean center starts without dulling standard steel pilot bits.

Best Used For:

• Fiber Cement Siding & Panel Hole Drilling: Boring pilot guides through abrasive Hardie board and cementitious exterior siding prior to deep-cut hole saw engagement.
• Ceramic Tile & Backer Board Penetrations: Centering hole saw cups accurately through glass-reinforced cement boards and wall tiles without edge chipping.
• Deep-Cut Hole Saw Arbor Guidance: Maintaining extended 4-inch pilot tracking through thick composite materials, abrasive plastics, and dense plaster walls.

Key Performance & Safety Features

• High-Performance Carbide-Tipped Edge: Custom carbide matrix retains sharpness when drilling dense fiber cement, porcelain, and abrasive ceramic substrates.
• Snap-Lock Plus Mandrel Integration: Designed for 3-second tool-free bit changes and instant arbor locking within Diablo quick-change hole saw systems.
• Extended 4-Inch Deep-Cut Reach: 101-6/10 mm total length provides optimal extension for deep-barrel hole saws cutting thick wall sections.
• 9/32-Inch Precision Guide Diameter: Accurately sized center shaft stabilizes hole saw cups to eliminate rotational wobble and hole distortion.
• Universal 1/4-Inch Hex Shank Base: Standard 6.35 mm quick-change hex shank locks firmly into impact drivers, extension chucks, and drill presses.
• Thermal-Resistant Tip Geometry: Precision-milled point dissipates friction heat rapidly to prolong carbide tip bonding during dry masonry drilling.

What's Included

• (1) Diablo 4" Carbide Tipped Pilot Drill Bit for Snap-Lock Plus Mandrels (DHS4BITCT)

Technical Specifications

Pro-Tip: Use light, steady forward pressure without hammer action when starting pilot holes in ceramic tile to allow the carbide tip to grind smoothly through the glaze without fracturing surrounding material.