2* Adapter Ring: 1*a + 1*b
Product Name: Ring Adapter
Material: metal
External thread: 49 mm/52mm
Size: approx. 60 x 6 mm
Female Thread : 58mm/2.28 inch
Size(Approx) : 60 x 6.8mm/2.36 inchx 0.27 inch(Max.D*H)
Color: black
Weight: 13 g.
The 52-58mm ring adapter easily screws onto the front of any 52mm lens, and converts the thread size of your lens to the thread size of any other 58mm accessory (such as filters, hoods, flashes and lens converters).
Extremely solid and lightweight.
Specifically designed for your camera for a tight and secure fit.
No wobbling or cross-threading.
The first number is always the lens thread size, the second number is the filter size of the accessory.
If the first number is bigger, it's a step-down ring.
If the first number is smaller, it's a step-up.
Package Content : 2* Adapter Ring