The RODAC 3/8 ratchet chain tensioner has adjustment hooks at the end for hooking the chain links (depending on the model).

Pull pin with chain; a must for drop leg jacks. Bulldog Genuine Replacement Part. Engineered for maximum strength and durability. The best way to maintain your Bulldog product's integrity is with genuine replacement parts from the most trusted name in the industry. Dimensions: 9/16” W x 2.75” L Weight: 0.45 lb Warranty: Limited 5 year