Only at Penn Elcom Online Square hole are great because you can constantly switch out the cage nut and place whatever equipment you need in the rack. Release the Latch which will secure the Rail in place. In Stock and Ready to Ship. This eludes to the fact that round-hole four-post rail kits, work in ALL four-post racks (both round and square hole types). Check out our range of Square Hole Rack Rails. Step 3.Cable Crossbar Attachment: Insert the hook located on the Spring Side into the square hole of the rack. We will do our best to match any price match request. If you have a four-post square-hole rack, then you can use any type of four-post rail kit (as threaded hole … Cagenuts are not very fun to place in by hand, so I … Dell ReadyRails Static Rails for 2/4-post Racks rack rail kit - 2U The ReadyRails™ static rail kit for 2U Systems provides tool-less support for 2/4-post racks with square or unthreaded round mounting holes including all generations of Dell™ racks. Rack Rail for square hole mounted electronics, servers Black powder coating finish .098" (2.5mm) steel thickness, available up to 45U (78-3/4") length 20U (35") Length Sold in pairs (2 rails per pack) Threaded over time can also dull out and basically render that area useless. I have some rack rails that seem quite poor at accommodating my square hole rack. Dell calls round-hole four-post rail kits, Versa rail kits. Page 3 Installation Instructions Step 2.Front Rack Attachment: Disengage the Latch and insert the front hook into the square holes of the rack.