Apple 922-9242 Screw, T10, Shoulder, DLT, PT3, 6, 4 mm, Pkg. of 5 for 21.5 inch iMac Late 2009 - 27inch iMac Late 2009 - A1311, A1312 - Apple Screws 922-9242 - iMac (21.5-inch Late 2009), iMac (27-inch Late 2009) Screw, T10, Shoulder, DLT, PT3, 6, 4 mm, Pkg. of 5