This is a used mount adapter from RAYQUAL, a Japanese manufacturer of high-precision mount adapters. It's a mount adapter that allows you to attach PENTAX K-mount lenses to FUJIFILM X-mount mirrorless cameras. I used it on an X-T2. It has an aperture ring, so you can use it with DA lenses. I used it a few times and then stored it in a dehumidified storage box. As a bonus, I'll include a body cap (with scratches) that I used with a PENTAX camera. 【Brand and Model】 The RAYQUAL PDA-FX mount adapter is a reliable, made-in-Japan product. It's made of high-quality materials and is durable. 【Functionality】 This mount adapter is an essential accessory for attaching specific lenses to different camera bodies. It expands lens compatibility and enables creative photography. 【Included Items】 The original box is included, making it convenient for storage and transport. - Brand: RAYQUAL - Model: PDA-FX (Pentax K lens → Fujifilm X body) - Country of Manufacture: JAPAN - Included Items: Original box - Color: Black Thank you for looking.