To mount an internal hard drive
Apple hard drive carrier or sled, 922-0621, stamped 815-0446.
Carrier used in PowerMac 6100, 7300,7500,7600, 8100. LC / Performa 520, 550, 560, 575, 577, 578. Performa 611x series. Quadra 840AV, Beige G3 Desktop and more.
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