Feature: 1. High Speed Steel Materials: Made of high speed steel, this hole saw kit offers high hardness and long service life. 2. Excellent Performance: Utilizing advanced production technology, the hole saw delivers strong performance, good wear resistance, and consistent quality. 3. Sharp Cutting Edge: The hole saw cuts cleanly and smoothly, resists chipping, and is easy to use. 4. Wide Application Range: Suitable for cutting holes in various metals including stainless steel, iron, and aluminum. 5. Compatible Tools: Can be used with hand drills, bench drills, and other standard drilling equipment. Specification: Item Type: High Speed Steel Hole Opener Material: High Speed Steel Color: Titanium Shank Diameter: Approx. 7mm / 0.3in Quantity: 5pcs Outer Diameter: Approx. 16mm / 0.62in, Approx. 18.5mm / 0.72in, Approx. 20mm / 0.78in, Approx. 25mm / 0.98in, Approx. 30mm / 1.18in Application: Suitable for stainless steel, iron, aluminum, and other metal materials Compatible Tools: Electric hand drill, bench drill, or other drilling equipment Package List: 5 x High Speed Steel Hole Opener 5 x Spring 5 x Wrench