Third picture shows how extender should be mounted on clasp. You may need to grind bracelet end during assembly. If your watch bracelet is too short
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Watch Bracelet Clasp Extender
Watch Extender
Купить Удлинитель ремешка для часов SILVER/удлинить ремешки/застежка/удлинитель, цена 1 590 руб — (203297586032)
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2pcs Watch Bracelet Extender Gold and Silver Extend Straps Bands Clasp Extension Link - AliExpress