Hottest universal hinges for eyeglass frame 5.2mm: 

Material: nickle alloy, lead free;

Size: 5.2mm width;

Installing ways onto frames:

by self-tapping screws: 3.0-6.0mm shaft length screws available;

by single rivets: 5.-10mm rivets available;

These screws and single rivets are matched completely free  as long as you make the option when placing the order.

Suitable for all kinds of material of eyeglasses which have the soldering problem, such as wood sunglasses,plastic sunglasses,aluminum frame,horn eyeglasses,bamboo sunglasses,plastic steel frames etc, it's installed by screws on or by rivets.

Drawing of TH-41:

TH-41 VS TH-45:

all other sizes are same, except the shape in the connecting position, it's square for TH-41 but round for TH-45.