Features: Engineered for accuracy and durability, this robust square hole punching delivers clean 86mm electrical box cutouts with guided accuracy, eliminating errors and boosting efficiency by 50% for unflawed wall installations. Featuring a auto centering design and carbon steel construction, the tool attaches seamlessly to standard drills for rapid 15 second installations while maintaining corrosions resistance in demanding environments. Ideal for electricians, renovation contractors, and craft enthusiasts requiring professional grades performances in time sensitive projects like home upgrades or commercial retrofitting. Perfect for creating flush mounted outlets during dry wall installations, wood panel retrofits, or cable management systems setups in residential and commercial spaces. Its ergonomic grip reduces hand fatigue during extended use, combining power tool compatibility with multi materials versatility to simplify electrical box cutouts across construction and remodeling tasks. Specifications: Materials: Alloy Size: Approx.14.6x8.6x4.5cm/5.74x3.42x1.77inhces Type: Square 86 Back Box Hole Opener Package Includes: 1Pc Square 86 Back Box Hole Opener note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color. Thanks!