The basics The 45mm Quick-Change Rotary Cutter a rolling razor blade used to cut materials into shapes, strips and pieces for craft projects. The benefits The Quick-Change Rotary Cutter has an easy blade change with just a single click. The uses The innovative spilt blade cover allows for switching hands effortlessly without reassembly and offers extra safety protection while cutting. The bottom line The blade is made of high quality tungsten carbide tool steel for unparalleled sharpness and superior edge retention. Designed for both right-and left-handed use.