X-ACTO X239 Extra Fine Razor Saw Blade. For Delicate Sawing in Confined Areas. Balsa wood, fiberglass, plastic, and railroad tracks. 5 1/2 inch Long x 1 1/4 inch Deep, 52 teeth per inch, 0.012 inch Thick Extra Fine Saw Blade. Fits 3/8 inch Type C, and Type D handles, as well as Excel K5, K6, and K7 Handles.