Rotatrim RC RCM12 12-Inch Cut Rotatrim Professional-12 Cutter Increased cut capacity, designed for every day continuous use Flexible two-way cut Finest quality Sheffield Steel self-sharpening precision blades Twin chrome steel guide rails completely eliminate head swivel whilst delivering a smooth gliding action Metal end frames and head Chrome Twin Steel Guide Rails - provides smooth operation and heavy duty use. All Metal Cutting Head - provides years of trouble free operation.