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The MINERALLAC 86514 is the MPD4S 1/4-inch pilot drill bit designed for use in electrical and mechanical trade applications where precise pilot holes are required before driving fasteners or anchors. This drill bit supports clean, accurate entry into materials commonly encountered in electrical, HVAC, and plumbing rough-in work. Weighing 0.44 pounds, it is a compact, single-piece tool suited for standard drill drivers and hammer drills used in the field. Electricians, HVAC installers, and general trade contractors rely on pilot drill bits like the MPD4S to reduce material splitting and improve fastener seating accuracy.
The MINERALLAC 86514 MPD4S is intended for trade professionals performing installation work that requires pilot drilling ahead of screw anchors, drive pins, or toggle-style fasteners. It is well suited for use in residential and light commercial construction environments where consistent hole diameter and bit durability are required across repetitive tasks.
Designed as an OEM-style replacement or direct-use pilot drill bit for trade applications requiring a 1/4-inch diameter pilot hole prior to fastener or anchor installation.
Installation of pilot drill bits should be performed by qualified trade professionals using appropriate personal protective equipment including safety glasses. Ensure the drill driver or hammer drill is powered off and the chuck is secured before inserting or removing the bit. Follow applicable codes and jobsite safety requirements when drilling into walls, ceilings, or structural members where concealed wiring or piping may be present.
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