Master Necklace Leash and hardware set is a Stainless Steel Necklace the chain is a Smooth Leash Cuban Styles Chain with several linking options. The closure is a spring snap that will fit thru any chain link along with 2 stainless steel split rings that can be moved to tighten the hold. This as all stainless steel so no plating to wear off.  Can also be work as a Wallet Chains see 2nd photo. 

Necklace comes with 2 split rings and 1 Spring Ring ( Carabiner Clip ) 

Deluxe hardware set up has 2) 4-5 mm Spring rings, 20 Split Rings, 1) Shackle Clasp,  and 1) Monster 8 mm Carabiner

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