The ASTM D6039/D6039M-18 standard specification covers five types of open and covered wooden boxes for transportation needs with a net load of up to 4,000 lbs (1814 kg). The specification defines in detail two open box types (types A and B) and three covered box types (types I, IV, and V), each with different design and use requirements. Type A is suitable for heavy-duty and multiple-shipment items, while Type B is suitable for handling and transportation of light hazards. Type I, IV, and V boxes are used for general purpose applications, Type II is suitable for items that do not require additional support, while Type III is used for structural members. The specification also specifies the construction and assembly requirements of the box to ensure the performance and safety of the box during transportation.