Features 1. Practical and Durable: This high-speed steel hole opener set offers a long service life and strong durability for reliable performance. 2. Multipurpose: Capable of drilling holes in stainless steel, low carbon steel, cast iron, aluminum plate, alloy plate, plastic plate, copper, and brass. 3. Applicable Scenarios: Suitable for use with handheld electric drills, vertical electric drills, and portable belt magnetic drilling machines. 4. High Strength: The hole saw set undergoes special heat treatment, providing sharp cutting edges and enhanced strength. 5. Wear Resistant: Made from high-speed steel, the hole openers are wear-resistant, heat-resistant, and feature high hardness, making them effective metal cutting tools. Specifications Item Type: High-Speed Steel Hole Opener Set Product Material: High-Speed Steel Product Sizes: Approx. 16mm (0.6in), Approx. 18.5mm (0.7in), Approx. 20mm (0.8in), Approx. 25mm (1.0in), Approx. 30mm (1.2in) Applications: Suitable for stainless steel, iron sheet, aluminum alloy, and other materials Package List 5 x High-Speed Steel Hole Opener 5 x Wrench 5 x Plastic Box