This macro ring set consists of 5 parts:

• front female Olympus OM mount
• rear male Olympus OM mount
• spacer #1 (7mm)
• spacer #2 (14mm)
• spacer #3 (28mm)

The connection thread between these parts is M57x0.75.

Minimum extension distance (just front and rear part) - 16mm

Maximum extension distance (all 5 parts assembled) - 65mm

This is a Chinese product. We tested it before listing it for sale. Both the lens and camera connections are reasonable tight, and hold firmly.

We bought these sets to use the front parts (female Olympus OM mount) as components for other special adapters, since we can't make female bayonets properly ourselves. You can find these sets cheaper in other stores, but if you buy something else from us, you may want to add this set to the cart to save on shipping.