Campbell Chain & Fittings 0143536 Grade 30 Proof Coil Chain, 5/16", Galvanized, 75 ft, Square Pail. Excellent low carbon steel chain for general purpose applications. Frequently used for fabricating tow chains, binding and logging chains, marine, and other general applications. Proof tested. Design Factor: 4 to 1. Packaged in pail. Made in the USA. Do not use for overhead lifting. Do not exceed working load limit. Material Diameter: 0.31", Inside Length: 1.27", Inside Width: 0.47", Working Load Limit: 1900 lbs., Links Per Foot: 9.4. Material Number: T0143536.