This product is either discontinued or we cannot get that from suppliers.
Qnap TRAY-35-NK-WHT01 HDD Tray For HS-453DX without Key lock NAS Accessories, Bay Compatibility 3.5", Metal, White.
QNAP TRAY-35-NK-WHT01 3.5" HDD Tray for HS-453DX, without key lock, white, metal, Qnap HDD Tray For HS-453DX without Key lock (TRAY-35-NK-WHT01).