hidden hinge round for plastic eyeglass 4.0mm TH-91
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Round hinges for top plastic wood eyeglass 4.0mm
Lead free hinge, could pass CE certificate.
4.0mm size with 10mm very long front hinges, popular size;
Round shape hinge, 3 barrels hinge.
Mostly used on top grade plastic eyewear and acetate sunglasses.
Made of high nickel alloy with lead free, nickel colored .
Installing way: melted into plastic frames under high temperature.
drawings of hidden hinge TH-91:
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