ProMaster 58mm Circular Polarizer

Thread size: 58mm (front and back)
Outer diameter: 60.3 mm
Frame thickness: 4.9 mm (not including threads) / 6.9 mm (including threads)
Glass thickness: 2.0 mm
Glass type: SchottTM B270 optical glass
Polished: Yes
Coatings: 12 layers
Light transmision rate: maximum 87.1% / average 42.9% or about 1.2 f-stops (average at 400 - 700 nm)
Reflection: less than 0.5% (average at 400 - 700 nm)
Frame material: Aluminum
Made in Japan