Instructions for use:When equipped with a thin plate hole opener, first insert the front end of the electric drill and the cutter into the round hole of the hole opener, connect the cutter to the electric drill and lock it, and then tighten the three sticks and screws on the shelf. , To prevent the hole opener frame from sliding; insert the ruler rod into the small square hole of the frame with the left to right positioning pin facing up, and finally adjust and tighten the top screw according to the size of the cut arc to fix the ruler rod firmly , In order to the accuracy of cutting round holes. When cutting standard arcs, a thin plate hole opener should be used to keep the arc cut surface smooth and beautiful. You should also drill a 3 mm positioning hole first, then drill a 12 mm hole, and extend the cutter head into the hole. Cut inside and outside circles. technical parameter: 1. There are two cutter heads, adjustable head cutting 2. The cutter head can be positioned 360 degrees in any direction 3. Optional 8mm electric or pneumatic drill, rotating speed 1500-3000 rpm 4. The minimum cutting radius is 12mm 5. Allowable cutting thickness Ordinary iron plate: 1.8mm Stainless steel plate: 1.2mm Copper and aluminum plates: 2mm Plastic plywood car: 2mm Daily maintenance: 1. It is important to add oil frequently at the of the cutter head, especially when cutting aluminum plates. 2. Turn on the electric drill first, then cut, and when it is finished, first exit and then turn off the electric drill. 3. When cutting, the incision of the cutter bar must be perpendicular to the workpiece to be cut to prevent the cutter head from being broken. 4. Blade replacement: Open the protective cover, take out the lock nut, loosen the set screw, pull out the bladewith pliers, reinstall the blade, and tighten the screw. 5. Tool holder replacement: unscrew the compression cap counterclockwise and replace it with a new tool holder. Colour:silver+black Material:Alloy + plastic Size:about 18 x 6cm Package Contents: 1 x cutter 1 x handle 1 x wrench 1 x barrel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.