Features: Can expand your system and storage capacity with an additional hard driveModular construction， you can just remove the CD driver and put this in the slotSupport installation of 2nd operating system on the 2nd HDD and boot selectionPlug and play， easy to useThis device accept 2.5"/9.5mm SATA HDD or SSDDimension: 129 x 127 x 9.5 mm4 mounting screws are includedCompatibility: MacBook and MacBook Pro that has a 9.5mm-high SuperDrive with SATA interface. Including but not limited: MB466/MB467/MB470/MB990/MB371/MC226 (Please check your CD/DVD drive before bidding it)Package Includes:1 x HDD Caddy4 x ScrewKeywords: HDD caddy， HDD caddies， Apple MacBook