The RackGold Cage nuts snap into square hole rack rails, giving you various threading options such as 10-32, 12-24, M5 or M6. Dell servers typically use 10-32 style threading, Compaq most often use M6 threads. Most telco 2-post relay racks use 12-24 threads. The nut is housed within a 3/8 inch spring metal body. When each side tab on the body is compressed, the nut can be inserted into the square hole in the rack rail. Most often used for mounting of servers, rack shelves, switches, routers, and other networking, electronic and data equipment. Snap-in Design - Captive nut and spring steel cage feature wings that can be compressed to snap into the square holes found in universal/punched panel rails. Unlike slide on cage nuts, this design locks the nut securely in place. Easily Replaced- Take away the hassle of dealing with stripped holes in tapped rails. If you strip a cage nut they can easily be replaced in the field, saving you time and money. Choose Your Size - Using universal rack rails and cage nuts gives you the flexibility to use whatever size hardware you prefer. You can even use multiple sizes in the same installation. So now you can use smaller rack screws and cage nuts for lightweight rack shelves, cable managers, and spacer blanks, and larger hardware for heavier equipment such as servers, UPS's and KVM switches. Added Strength - The construction and materials used are better suited for threading than what is used in full size tapped rails. This provides a stronger, more durable fastening solution. What's included? Qty 25 - 12-24 Zinc Cage Nuts - USA Made