OWC in-Line Digital Thermal Sensor HDD Upgrade Cable and Install Tools for iMac 2011, (OWCDIYIMACHDD11) Includes all cables and tools necessary for drive installation into main drive bay of Apple iMac 2011 Models-Hard drive sold separately Upgrade your iMac with any SATA drive, No Software hacks, AHT Diagnostic compatible Compatibility: 2011 iMac 21.5 inch (Model ID: iMac12,1) 2011 iMac 27 inch (Model ID: iMac12,2) Includes: OWC In-line Digital Thermal Sensor Cable, 2 suction cups for the outer glass removal, OWC Torx T8S Driver, OWC Torx T10S Driver, NewerTech Pry Tool, OWC Microfiber Pro Cleaning Cloth 1 Year OWC Limited Warranty- Free install videos available on manufacturer's site Required for any drive installed into the main drive bay. Eliminate fan noise and maintain correct system fan control when upgrading your 2011 iMac. The only iMac HDD upgrade option on the market certified to pass the Apple Hardware Test. Fixes firmware incompatibility issues with third party hard drives. Engineered in-house and backed by OWC&#039;s award-winning customer support. OWC In-line Digital Thermal Sensor Cable (1) OWC In-line Digital Thermal Sensor Cable (2) OWC 2-1/4&#034; Suction Cup (1) Torx T10S Driver (1) Torx T8S Driver (1) Nylon Pry Tool (Spudger) (1) OWC Blue Microfiber Screen Cleaning Cloth iMac (21.5-inch Late 2011)(August, 2011)<span class="a-text-bold">Model ID:</span>iMac12,1 (3.1GHz i3) iMac (21.5-inch Mid 2011)(May, 2011)<span class="a-text-bold">Model ID:</span>iMac12,1(2.5GHz i5, 2.7GHz i5, 2.8GHz i7) iMac (27-inch Mid 2011)(May, 2011)<span class="a-text-bold">Model ID:</span>iMac12,2 (2.7GHz i5, 3.1GHz i5, 3.4GHz i7)