Features CEMENTED CARBIDE MATERIAL: The drill bit is made of premium TCT cemented carbide (cemented carbide cutting head) and ti plated cemented carbide teeth, ensuring its high hardness, rust prevention, and durability. 3 BLADE DESIGN: TCT hole saw adopts a three blade design, including the outer blade, middle blade, and inner blade, making it sharper and more efficient, making it very suitable for cutting hard metal. MULTIPURPOSE TOOL: This hole saw set is suitable for bench drills, magnetic drills, impact drills, etc. Very suitable for hard metals, stainless steel plates, iron, cast iron, wood, fiberglass, and other general plates. HIGH ACCURACY AND EASY TO USE: TCT cemented teeth can quickly cut clean circular holes. Suitable for handheld electric drills, vertical electric drilling machines, and mobile belt magnetic drilling machines. 6PCS BITS: There are 6 pieces drill bits in the package that can be used respectively to meet your different needs. With a storage box, these bits are easy to carry. Specification: Item Type: TCT Hole Saw Kit Material: Cemented Carbide Opening Diameter: 16, 18, 20, 22, 25, 35mm (5/8in, 23/32in, 25/32in, 7/8in, 1in, 1 3/8in) Opening Depth: 25mm (1 inch) Shank Diameter: 3/8 inches Package List:6 x Hole Saw1 x Hex Wrench (Excluding the number of sets)1 x Storage Box  Note:1. Cannot be used for concrete, ceramic tiles, and stone.2. There may be slight errors in size. Package List 6 x Hole Saw 1 x Hex Wrench (Excluding the number of sets) 1 x Storage Box