The bottom hole distance is 44mm, and the bottom hole can be installed in the position of 3.5mm hard drive in the chassis. (Please carefully measure the hole spacing of the hard drive in your case. It must be exactly the same as the hole at the bottom of the hard drive before it can be installed) The distance between screw holes on the upper and lower layers:3cm This bracket has no partitions, and the hard disk is installed directly on the side panel. This link does not include hard drives, only brackets. Name:2-layer L-shaped hard drive bracket Features:Hard drive storage and storage, beautiful and tidy, with screw holes at the bottom, can be installed on the chassis Hard drive:2/3 3.5-inch hard drives available Fan:can install 1 5010 fan Colour:Black Material:Metal Size:Dimensions after installing the hard disk:146 (length) x103 (width) x62 (height) mm; Single side size:146mmx62mm; The width of the L-shaped protruding part is 15mm Package Contents: 2 * brackets 1 * fan with mounting screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.