Cuts ultra hard aggregate, non-abrasive sand. Soff Cut FLX line of Ultra Early Entry diamond blades have the same features of Excel Series blades but offer a more economical priced option. The FLX blades also feature the triangular shaped safety arbor that fits precisely on the patented Soff Cut saw arbor. This blade fits Soff-cut models 4000, & 4200 and includes the skid plate.