1Carbide teeth are used to cut clean round holes quickly. Suitable for handheld electric drills, vertical electric drilling machines and mobile belt magnetic drilling machines 2Drill holes with stainless steel plates, high alloy steel, iron, aluminum, castings, plastics, glass steel, etc 3Precise grinding design, gears and step guide bit, more precise, smoother, faster and safer, leaving a perfect cutting effect 4The hole saw set has 5 different sizes of hole saws, which can be used to make different holes 5Each hole saw is individually packed in a plastic box, and each box is marked with a size for easy use Item Type: Hole Opener Material: HSS (High-Speed Steel) 5-Hole Saw: (Cutting Diameter: Approx. 30mm or 1.2in,Approx. 25mm or 1in,Approx. 20mm or 0.8in,Approx. 18.5mm or 0.7in,Approx. 16mm or 0.6in) Purpose: Mid-Range Patek of Common Materials is Used to Open Rubber, Plastic, Thin Iron Sheet, PVC Openings, Etc 5 x Hole Opener 5 x Wrench 5 x Plastic Box Please allow 0and 8209 2 cm error due to manual measurement. Thanks for your understanding.