Feature: 1. The bimetal band saw blade is preferred, and the cutter head is made of M42 high-speed steel, which has been quenched at high temperature. 2. The positioning drill bit of the hole opener is accurate and stable, using high‑quality high‑speed steel materials, and has a long service life. 3. Great workmanship, unique opening design, accurate positioning, can perfectly meet your punching needs. 4. Equipped with a quick‑release spring, easier to be taken out after cutting. 5. Wide range of applications, can be used to open holes in various wood panels, acrylic, aluminum gussets, iron sheets and other materials. Specification: Item Type: Bi-Metal Hole Saw Cutter SetMaterial: M42 high speed steel Use Equipment: Hand drill, bench drill and other flat drilling equipment Applicable Scope: Can be used to open holes in various wood panels, acrylic, aluminum gussets, iron sheets, etc. Size (Dia): Approx. 80mm / 3.1in85mm / 3.3in 90mm / 3.5in 95mm / 3.7in 100mm / 3.9in 105mm / 4.1in 110mm / 4.3in 115mm / 4.5in . Package List: 2 x Hole Saw Cutter 2 x Drill Bit