Thin-plate hole opener for precise circular and arc cuts in thin sheets. It combines a drill-ready cutting head, a stable frame, and a ruler rod for accurate positioning. Benefits include smooth arc surfaces, secure operation, and flexible 360-degree head positioning. How to use - Step 1: Insert the front end of the electric drill and the cutter into the round hole of the hole opener. Connect the cutter to the drill and lock it. Then pull the three sticks and the scar screws on the shelf to prevent the hole opener frame from slipping. - Step 2: Insert the ruler rod with the positioning pin from left to right into the small square hole of the frame. Extend to the top and adjust the top screw according to the desired cutting arc size, then pull to fix the ruler rod for accurate round-hole cutting. - Step 3: For standard arches, use the thin plate hole opener to keep the arc surface smooth. Drill a 3 mm positioning hole first, then a 12 mm hole and drive the cutting head into the hole to cut inner and outer circles. Technical parameters - Cutting heads with adjustable cutting head. - The cutting head can be positioned 360 degrees in the direction. 2-3 practical use scenarios - Create precise round holes in thin metal or sheet panels for electrical outlets, wiring panels, or ventilation grilles. - Cut smooth arches or circular cutouts in cabinets, speaker enclosures, or decorative thin panels. - Enlarge or refine existing round holes with controlled arc cuts by selecting appropriate arc size and using the ruler rod for accuracy.