Precision-Engineered Flexible Drill Bit for Professional Installers: This 54" extra long flexible drill bit features a 9/16" auger head with 1/4" hardened shank, designed specifically as an electrical drill bit for running wires through wood studs, OSB, and drywall. The 3-flat anti-slip shank ensures secure chuck grip during angled drilling operations. Bi-Directional Wiring Solution with Enhanced Control: Unique dual fish-eye holes transform this flex drill bit into a complete wiring system - drill forward then reverse-pull cables through wall cavities without damaging surfaces. Perfect for installer drill bit applications in finished ceilings and tight 20-30° spaces. Industrial-Grade Construction for Demanding Jobs: CNC-machined from solid carbon steel with machine-sharpened screw tip, this long flexible drill bit maintains 90° flex capacity through 1000+ cycles. One-piece design eliminates weak joints common in cheaper flex drill bit extensions. Universal Compatibility & Smart Retrieval: Works with all 3-jaw drill chucks (1/4"-5/8") as the ultimate long drill bit for electrical wiring. Tapered head design enables easy extraction from dense materials like hardwood beams and LVL structural members. Pro-Grade Maneuverability Package: Engineered for drywall/plaster wall fishing, this flexible drill bit extension combines 540° twist capability with 0.5mm diameter tolerance. Includes: Heat-treated cutting flute (Rockwell C55); Anti-snap spiral reinforcement; Non-marring tip protector; Ideal for HVAC/R & low-voltage cable installations. Flexible Installer Drill Bit 9/16 Inch x 54 Inch, Wire Pulling and Fishing, Auger Head Installer Drill Bit, Fish Bit for Pulling Wires in Walls Ceilings and Sidewalks, 1/4" 3-Flat Anti-Slip Shank