Made of alloy, light weight and suitable for long term use. Precision machined to ensure a perfect match with your camera. Both the camera side and lens side of the adapter are made of high quality aluminum alloy, machined and chrome plated. Snug fit and solid connection - the lens will not wobble when mounted on the adapter, and will fit the lens without any adjustment.
Thanks for looking. I also have a powered zoom B4 lens for sale that is pin sharp.