Ring has 2 types: "No.1 Ring" is a O-shape ring, "No.2 Ring" is a special-shaped ring. Please select what you want.
Ring has 3 sizes (inner diameter) can be selected: 1.57'' (40 mm), 1.77'' (45 mm), 1.97'' (50 mm).
Total length is about 1.57'' (40 mm).
Cage length is about 0.98'' (25 mm).
Cage inner diameter is about 1.38'' (35 mm).
These sizes may have a little error because it's made by hand.
Weight is about 160 grams.