Size: 5/16"Overall Length: 2-7/8"Jaw Opening: 7/16"Safe Working Load: 1,760 lbs.Material: SteelFinish: Zinc PlatedDesigned For Fast, Easy Connections Between Two Lengths Of Chain Or For Attaching Accessories To ChainHex Locking Coupler Nut For Easy Opening And ClosingDo Not Use For Overhead Lifting