There are two cutter heads with adjustable cutting heads, and the cutter heads can be positioned 360 degrees in any direction. It is particularly important to add oil frequently at the of the cutter head, especially to cut aluminum plate. Turn on the electric drill first, then cut it, and at , quit the electric drill first and then turn it off. When cutting, the cut of the cutter bar must be vertical to the workpiece to be cut, so as to prevent the cutter head from breaking hard. Tool holder replacement: open the protective cover, take out the lock nut, loosen the set screw, pull out the tool holder with pliers, reinstall the tool holder, and tighten the screw. Tool holder replacement: unscrew the compression cap counterclockwise and replace it with a new tool holder. Name: Double-headed metal sheet cutter set Minimum cutting radius: 12mm Speed requirement: 1500-3000 rpm. Reference of cutting thickness: common iron plate 0.8mm, copper, aluminum plate 2mm, plastic plywood 2mm, stainless steel plate, not recommended. Colour:silver+black Material:Metal+Plastic Package Contents: 1 x Double-headed metal sheet cutter set 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.