Balsa Stripper Master Airscrew MA4000. Made by Windsor Propeller LLC. USA. Easily cuts precision strips up to 1/2" wide and 1/4" thick. For balsa and other soft wood. The design has a lead screw with 32 threads per inch so that each turn of the wheel will move the blade 1/32 of an inch. The blade included is a type 11 used in modelling knives.