It prevents the lens from scratching when slip in/out of the tube case. Lens Size: 45mm x 20mm. Length Between Lens: 20mm. Lens Size: 43mm x 20mm.
Tube Case Reading Glasses Portable Aluminum Alloy Tube Case Spring Hinges HM01
Portable Reader Slim Pen Reading Glasses with Pen Clip Tube Case Reading Glasses
Pen Tube Case Reading Glasses +0.5~+4.0 Spring Hinges Aluminum Alloy Case L282
Tube Case Reading Glasses +0.5~+1.25 Metal Frame Spring Hinge Alloy Case L292
