1、[Adjustable Hole Diameter] Our adjustable punching saw can open holes ranging from 25 to 130mm, 1/4 to 5 inch. Simply loosen three screws, adjust the scale disc to the desired size, tighten the screws, and you can connect it to a drill for hole punching. 2、[Debris Collection] When drilling into ceilings, this round hole saw can collect most of the edge debris, making your work safer and more convenient. 3、[Enhanced Durability] With higher hardness, toughness, cutting strength, and wear resistance, this adjustable hole saw tool ensures long lasting performance for various applications. 4、[Clean Cutting] The three 3 tooth cutters can effortlessly cut through dry wall and softwood, with special straight sawtooth ensuring clean and accurate cuts. 5、[Versatile Usage] Suitable for cutting holes in wood, plywood, plastic, dry wall, soft gypsum, chipboard, acrylic sheets, thin metals, etc., also suitable for home projects on ventilation ducts, speakers, ceiling lights, and more, perfect for furniture repairs and woodworking projects.