Bosch Pilot Bit HB85PB 3-3/8 Inch High Speed Steel Quick Change Hex Shank (1/4 Drill Diameter Wood Bi-Metal Hole Saw Alignment Starter Precision Attachment)

Professional 3-3/8-Inch High-Speed Steel Quick Change Pilot Bit with 1/4-Inch Drill Diameter for Bi-Metal Hole Saw Alignment and Rapid Accessory Swaps

The Bosch HB85PB 3-3/8 Inch High-Speed Steel Quick Change Pilot Bit 1/4 Inch Hex Shank for Bi-Metal Hole Saws delivers precise starting-hole alignment utility and exceptional rotational power transfer efficiency across demanding carpentry framing arrays, interior cabinetry installations, and heavy-duty general construction plumbing rough-ins. Engineered from premium high-speed steel (HSS) metallurgy precision-ground to a 1/4 inch diameter, this high-performance layout tool accessory withstands extreme rotational friction heat accumulation zones without tip dulling or bending failures. This professional contractor solution resolves frequent accessory replacement holdups when switching between varied hole saw diameters, slow drilling start-up bottlenecks on dense dimensional timber, and shank slippage errors inside universal mandrels by combining an aggressive flute geometry with a secure 1/4-inch hex power shank connection hub. Outfitted with an exact 3-3/8 inch overall length index, a specialized 1-3/8 inch flute depth, and native cross-platform compatibility for Bosch PCM-series Quick Change™ mandrels, this robust pilot hardware optimizes subcontractor project turnaround timelines during multi-aperture cabinetry layouts, structural header boring routines, and continuous large-diameter circular profiling sequences.

Best Used For:

• Precision Framing Bores: Establishing exact center-point tracking holes for bi-metal hole saws through dimensional lumber, plywood, and soft composite board foundations.
• Subcontractor Utility Rough-ins: Excavating wide drainage ports, waste line junctions, and technical pipeline runs cleanly through interior partition headers and subfloor decking.
• High-Volume Cabinetry Layouts: Rapidly drilling clean pilot entry points for electrical fixture housing, plumbing hardware mounts, and custom mechanical pass-through pathways.

Key Performance & Safety Features

• High-Speed Steel (HSS) Metallurgy: Industrial-grade hardened steel composition maintains acute cutting edges through repetitive wood-boring cycles, checking premature tip wear.
• Quick Change System Integration: Precision-milled shank fits natively into Bosch PCM-series mandrels, facilitating near-instant accessory swap-outs during complex site fabrication sequences.
• Slip-Free Hex Shank Tang: Robust hexagonal shank profile locks tightly into drill chucks and mandrel adapters, preventing rotational slippage under high-torque drilling loads.
• Aggressive Flute Geometry: Optimized 1-3/8 inch flute architecture lifts sawdust and wood chips away from the hole rapidly, minimizing friction heat accumulation natively.
• Structural Accuracy Build: Balanced overall 3-3/8 inch chassis provides the exact required reach to clear deep bi-metal hole saw cup walls for full bore penetration.

What's Included

• (1) Bosch HB85PB 3-3/8-Inch High-Speed Steel Quick Change Pilot Drill Bit

Technical Specifications

Pro-Tip: Before beginning your bore, ensure the pilot bit is fully seated and locked within the mandrel hex tang. This prevents the bit from backing out during the heavy percussive shock of bi-metal hole saw contact, maintaining your center-line alignment perfectly through thick layered wood substrates.