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Creative Square Hole Cutter for Electrical Box, Stainless Steel Slot Cutter. 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 square holes in 86-type boxes, drywall, marble, and concrete. Ideal for DIY: Streamlines workflow for residential and commercial electrical installs.