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A tie down strap is a length of webbing that is tensioned and used to secure cargo or equipment for transportation. They are available in lengths ranging from around six feet for small loads to 40 feet for commercial trucking applications and typically range from one inch to four inches wide. Tie-down straps come with two ratings to indicate overall strength; break strength describes the maximum comfortable weight that can be supported before the strap fails, and working load describes the maximum weight that a tie-down can support with regular day-to-day use without becoming damaged. The working load is generally calculated as one-third of the break strength.