Works for the below products from Apple, but not only.
Please ask us if you are not sure
iMac (27-inch Mid 2011)
iMac (27-inch Mid 2010)
iMac (21.5-inch Late 2011)
iMac (21.5-inch Mid 2011)
iMac (21.5-inch Mid 2010)
MacBook Pro (17-inch 2011)
MacBook Pro (17-inch Early 2011)
MacBook Pro (15-inch 2011)
MacBook Pro (15-inch Early 2011)
MacBook Pro (13-inch 2011)
MacBook Pro (13-inch Early 2011)
Mac mini (Mid 2011)
Mac mini (Mid 2011 Server)