After heat treatment, the cutter body has good performances of high concentricity and strong torsion resistance. The hole opener can be applied to open wood hole, gypsum board hole, three plywood hole, light box hole and spotlight hole. The circle hole saw cutter has good contact performance, ensuring stable working. The hole opener can be applied to open wood hole, gypsum board hole, three plywood hole, light box hole and spotlight hole. The scale is accurate and adjustable, and the hole diameter can be adjusted by the distance from the cutter head to the center., Manufacturer: Wosune