1. Zinc Aluminum Alloy Material Our adjustable punching saw is made of nylon and zinc aluminum alloy, sturdy and wearresistant. It is easy to saw plasterboard and cork board. 2. Wide Application Our round hole drilling saw is suitable for drilling holes on wood, plywood, soft plaster, plastic, drywall, cornhole board, acrylic board, thin metal, and more. It is also suitable for household projects like air ducts, speakers, and ceiling lights. 3. Safe to Use This adjustable hole saw is very to use. It can collect most of the edge debris when drilling the ceiling. It has higher hardness, toughness, cutting strength and stronger wear resistance, a good tool for furniture repair and woodworking projects. 4. 3Teeth Cutter 3 tritooth cutters are easy to cut dry walls and cork boards. The straight teeth ensure clean and fine cutting. 3teeth design can achieve straight round effect, smooth cutting without burrs.