4mm hidden hinge for acetate eyeglass TH-69

TH-69 4.0*180 round
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Please note the price includes one pair of hinge instead of one piece,thanks!

This hinge is made of high nickel,with nickel color plated.

4.0mm width with 3 jointes,180 degree hinge,it's round end and the front hinge should be melted into frames' side straightly.

Mostly used on top grade plastic eyewear and acetate sunglasses.

Installing way: melted into plastic frames by heat.

drawings of hidden hinge TH-69:

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