KaShDa Silver Plated 14MM Toggle Ring & Bar Necklace Extender 1" - 12" Silver Plated 14MM Toggle Ring & Bar Necklace Extender available in lengths from 1" to 12". 3.7MM Silver Plated Brass Core Curb Chain. The difference between the lengths is the length of the chain. 14MM (about 1/2") Silver Plated Zinc Ring and Bar. The stated length includes the Ring and Bar. The ring has a hole size of 11MM (just under 1/2"). The bar is 19MM (3/4") long. See IMPORTANT SIZE INFO below. The shorter lengths can be used on bracelet. A longer length can be used as a bracelet.