universal hinges 4.0mm for any eyeglass frame:

TH-39 hinge is very similar to the TH-23, but the TH-23 is bigger, 6.0mm wide, while the TH-43 is only 4.0mm wide，it is much smaller. This hinge suits most for glasses where there's only small space left for installing hinges on frame front.

It is suitable for any frame which exists soldering problem,such as wood sunglasses,plastic sunglasses,aluminum frame,horn eyeglasses,bamboo sunglasses etc,as its installed onto frame by pins or screws instead of soldering.

Material: high nickel with shinny nickel color plating.

Size:
4mm width, 4.0mm total height,

Drawing:

Ways of installing hinges onto frames:  by screws and single rivets, they will be enclosed as long as you make option online.