Additional Information | Threaded front flange mates with the Dell thumb screws (10-32 threads); Rack Flange Type: Standard "L" Shaped Uprights or Non-Standard "C", "Z", and "?" Shapes; Square Hole Racks: Compatible with the industry standard 3/8" square hole racks; Round Hole Racks: Compatible with all standard round (non-threaded) holes; Threaded Racks: Compatible with all standard threads including 10-32, 12-24, and Metric M6 |