This collar was made in polished surface handmade finished stainless steel with an O-Ring at the front.The collar secures with a small hex screw that is integrated into the locking tab on the side opposite of the hinge. The collar locks when the hex screw is screwed into a small grove on the lower portion of the locking tab， thereby preventing the collar from opening.
Please be extremely careful when closing the collar. The hinge has the potential to pinch as you are closing the collar.
Actual internal diameter may vary by ~2mm (smaller or larger)， as these are made by hand. If you are unsure on the size， we recommend ordering the larger of the two sizes.
Offer size:internal diameter 11CM/12CM/13CM and 14CM
Internal diameter CHANGE to circumference are:11cm(circumference 34.5cm，13.6\'\' inches)，12cm(circumference 37.6cm，14.8\'\' inches)，13cm(circumference 40.8cm，16\'\' inches)，14cm(circumference 43.9cm，17.3\'\' inches)，15cm(circumference 47cm，18.5\'\' inches).
Notice:Please remark the size you request when order it， otherwise we will send you the random size.Thank you.
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