Permanently Locking Small Ring Day Collar, Sterling Silver, very delicate and discreet. Simple measuring guide available here This day collar has a locking link in place of a traditional clasp, allowing it to be permanently closed. See guide for instructions on how to close and lock the link. Once it is locked the only way to remove the collar is to cut it off, in an emergency a pair of sturdy nail clippers will cut through either the chain or the locking link itselfComes with free high-quality silver polishing cloth to help keep your collar in pristine condition.Materials: 925 Sterling silverDimensions:Ring – 1.8mm thick, 15mm diameterChain link size - 1.7 x 2mm (Belcher)Your necklace will be sent in the presentation gift box shown in the photographs, ideal for safe storage or as gift.Shown against a standard sized business card (55x85mm) for scale