THIS IS ONE VINTAGE SKIP TOOTH CHAIN MASTER LINK. MADE BY THE DIAMONDS CO AND ITS BEST TYPE, ITS A SNAP ON CONNECTING LINK, HERE IT SNAP. COMES RIGHT OF THE BOX FROM THE 1930S, THEY FIT DIAMOND CHAINS AND OTHERS, THEY ARE USED ON SCHWINN BIKES, SEARS, ELGIN, MERCURY, SILVER KING, ROAD MASTER, ROLL FAST, MONARK AND OTHER BRAND OF BIKES MADE IN THE 130S AND 40S, 50S. EASY SNAP ON TYPE, NO TOOL NEEDED. THEY ARE MINT NEW CONDITION STILL WITH THE OIL ON THEM. HARD TO COME BY IN GRAND CONDITION, GREAT FOR ANY ANTIQUE BIKE 20S PRE WAR 1930S 40S AND SOME 1950S BIKES, YOU NEED THIS ITEM TO SHORTEN OR ADD LENGTH OR TO CONNECT YOUR CHAIN. I HAVE OTHER MINT MASTER LINKS AND CHAINS IN NEVER USED CONDITION IF NEEDED IN MY EBAY STORE. YOU ONLY GET 1 SKIP TOOTH MASTER LINK NOT THE WHOLE BOX.