The Megadap ETZ21 Pro is a high-quality mount adapter with a metal mount and electronic contacts. - Model Name: ETZ21 Pro - Brand: Megadap - Included: Box, Instruction Manual - Features: Metal mount, with electronic contacts Thank you for viewing. I purchased this new in 2023 and used it for about a year with a Z50 and a TAMRON 17-70 F2.8. It was working normally the last time I used it. I am listing it for sale to organize my equipment. As far as I can see, there are no scratches, damage, rust on the electronic contacts, or damage to the mount parts on either the body or lens side.