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86-Type Square Hole Cutter for Electrical Box 1PC Creative Square Socket Puncher for Water & Electricity Installation Hand Tools. Durable Stainless Steel: Made of premium stainless steel for lasting strength and precision. Time-Saving Design: Unique shape digs deep square holes in concrete or wood quickly. Smooth Operation: Engineered for wobble-free cuts with most standard drills. Versatile Application: Cuts 86-type junction boxes, drywall, marble, and concrete. Ideal for DIY: Streamlines workflow for electricians and DIY electrical installs.