X-Acto - Razor Saw Blade - Extra Fine - 54 tpi - X-Acto Extra Fine Razor Saw Blade are great for Delicate Sawing in Confined Areas. Cuts balsa wood, fiberglass, plastic, and railroad tracks with ease. Xacto Extra Fine Razor Saw Blades are 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.