925 Sterling Silver Magnetic Trigger Clasp 2, Trigger clasps are highly popular jewellery findings that are regularly used in jewellery making to fasten chains, necklets, pendants and bracelets. The claw shaped clasp is opened and closed with the aid of a sprung ‘trigger’ component. These simple but sturdy jewellery clasps are ideal for a subtle look which does not detract from your pendant or necklace designs.