X-ACTO X75300 3pc Precision Razor Saw Set. Includes No. 5 Heavy Duty Plastic Handle and No 234 (4.5 x 3/4 inch, 40 teeth per inch, and .010 inch thick) and 235(4.5 X 1 inch, 40 teeth per inch, and .010 inch thick) Razor Saw Blades. For heavy duty sawing of railroad tracks and model parts.