5/16" x 4-1/2", Zinc, Screw Hook, Medium Weight To Heavyweight Screw Hook With Lag Screw Threads Is For Hanging Planters, Signs, Clotheslines, Etc, Safe Working Load 125 LB, Not Use For Overhead Lifting, Support Of Human Weight, Athletic Or Playground Equipment, When Safety Is Involved, Consult Manufacturer, Inspect Frequently, Bulk.