The standard "GB/T 13960.4-2009 Safety of removable power tools, Part II: Particular requirements for planers and film thickness planers" specifies safety requirements for removable planers and film thickness planers with a maximum planing width of 260 mm. This standard is based on the requirements of GB/T 13960.1 and focuses on the definition, function and safety of planers and film thickness planers. Definitions include planers, film thickness planers, and tools that have both functions (planer and film thickness planer). In addition, the standard describes the structure of the cutter shaft and indicates general precautions for testing. These requirements are designed to ensure the safety and effectiveness of power tools during use.