Protronix Hard Drive Caddy for Unibody Macbook / Macbook Pro SuperDrive (13 15 17) Replace the internal SuperDrive of your Unibody Macbook / Macbook Pro with a second hard drive or SSD drive Maximizes storage flexibility Compatible with 2.5-Inch / 9.5mm SATA Hard Drives and Sold State Drives Includes easy to follow, step-by-step instructions for installation Package Includes: 1x Hard Drive Caddy, 1x Spacer for HDD Tray, 1x Screwdriver, 1x Screw, 1x Installation Guide