4mm hidden hinge for acetate eyeglass TH-68

TH-68 4.0*90 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,it's round end and the front hinge should be melted into frames's front straightly.

Mostly used on top grade plastic eyewear and acetate sunglasses.

Installing way: melted into plastic frames by heat.

drawings of hidden hinge TH-68:

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