The grade of stainless steel strapping you need will depend on the specific application and the conditions in which it will be used. Generally speaking, the most commonly used grades of stainless steel strapping are 304 and 316.

304 stainless steel strapping is a versatile, general-purpose material that is known for its excellent corrosion resistance. It is often used in indoor and mild outdoor environments, and it is suitable for use in a wide range of applications.

316 stainless steel strapping is a higher grade material that offers better corrosion resistance than 304. It is often used in harsh outdoor and industrial environments, and it is particularly well-suited for marine and coastal applications. It is also resistant to high temperatures and chemicals, making it a good choice for use in a wide range of demanding applications.

If you are unsure about which grade is best for your specific application, it's best to consult with a professional in the field or with a supplier of the product, who can help you make the best choice for your needs.