Best Choice: If your iMac screen has scratches on the surface or broken defects on the corners of the screen due to touch scratches or too many years of use, this a1311 glass panel can perfectly cover the defective areas of the old screenthis will be your best choice.
^^ Compatibility: Compatible for iMac 21.5" A1311 lCD front glass panel 2011 year MC309LL/A, MC812LL/A, MC812LL/A, MC978LL/A.
^^ Identifying Numbers:
APN: 810-3553, 830-3936
PPN: 922-9795.
^^ Easy Installation: The front glass cover attached to the housing with magnetic force, and replacement can be performed by all skill levels, but a suction cup tool is recommended to help with installation.
^^ Tips: Before installation, please wipe the computer screen clean and remove the protective plastic film on the front glass.
^^ Description: This is the glass panel with 2 photo sensor hole near the iSight camera, making it backwards compatible with the Mid 2011 and Late 2011 iMac releases.