Easily Repair or Join Chains Together - Designed for use with 2" diameter plastic chains. 25 Master Links Included - 25 male and 25 female ring halves that snap together to create link. Create Durable and Permanent Connection - These links are designed to snap securely in place. Weatherproof and Durable - Made of durable plastic and UV inhibitors to eliminate brittleness. Made in USA - Since 1960, Mr. Chain has been the leading stanchion and plastic chain manufacturer.