Master Airscrew #MA4100 Razor Plane Adjustable Depth Cutting This is the Master Airscrew Razor Plane from Windsor Propeller Company. Engineered to use a special .017 x 1-3/4 blade. The cutting depth can be set accurately and rigidly. For balsa wood. It rounds and smooths the contours of cowlings and fuselages, shapes edges and thins strips. It uses a heavy duty industrial grade cutting blade. Blade is user replaceable. This is the Master Airscrew Razor Plane from Windsor Propeller Company. Engineered to use a special .017 x 1-3/4 blade. The cutting depth can be set accurately and rigidly. For balsa wood. It rounds and smooths the contours of cowlings and fuselages, shapes edges and thins strips. It uses a heavy duty industrial grade cutting blade. Blade is user replaceable.