Features 1、High Speed Steel Materials: Made of high speed steel, this hole saw kit has high hardness and long service life. 2、Excellent Performance: Using sophisticated production technology, the hole opener has excellent performance, wear resistance and stable quality. 3、Incisive Hole Saw: The hole saw is very incisive, the cutting is very flat, it is not easy to break, and it is easy to operate. 4、Scope of Application: Wide range of applications, suitable for opening holes in metals such as stainless steel, iron, aluminum, etc. 5、Applicable Tools: This hole saw kit can be used for hand drills, bench drills or other 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/0.62'', Approx. 18.5mm/0.72'', Approx. 20mm/0.78'', Approx. 25mm/0.98'', Approx. 30mm/1.18'' Scope of Application: Stainless Steel, Iron, Aluminum and Other Metal Openings Applicable 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