Features: This high carbon steel square hole drill bit ensures precise right angles cut in wood, reducing adjustments and speeding up electrical box installations for efficient wall slotting. Featuring durability alloy steel construction with standard drill bit interfaces, it provides enhanced wear resistance and compatibility for 86 type junction box electric hammers for seamless operate. Ideal for professional plumbers and electricians, this tool caters to tradespeople needing reliability accessories for demanding electrical and plumbing tasks. Perfect for residential and commercial settings, it handles various wall types, facilitating smooth electrical wiring, home renovations, and wall slotting projects. With ergonomic design that optimizes force distribution and minimizes fatigue, this portable electric hammer hole enlarging tool accelerates project timelines while delivering stable cutting performances. Specifications: Product name: Type 86 wire box hole opener Component: alloy steel Size:Approx.85x45x25x165mm / 3.34x1.77x0.98x6.5inch, Handle Height:Approx.135mm/5.31inch Product features: simple operate, time-saving and labor-saving, sturdy and durability, convenient and fast Applicable: Electric hammer, 86 type junction box Package Includes: 1pc Hole Drill Bit note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.