ICY DOCK's FLEX-FIT Duo MB343SPO is a lightweight yet durable 3.5-inch to 5.25-
inch mounting kit bracket that utilizes a single stardard external 5.25'' computer bay to
accomodate a 9.5mm Ultra-Slim ODD and 3.5''HDD/ device.
source：https://global.icydock.com/resources/product_reviews_1410.html