| Feature | Round (Threaded) | Square (Unthreaded) | | :--- | :--- | :--- | | Thread/size | 10-32 UNF (or 12-24 for some) | None – accepts cage nuts | | Hole diameter | 0.169–0.180 inches | 0.375 inches square | | Advantages | High vibration resistance | Adjustable, supports metric screws via cage nuts | | Disadvantages | Cross-threading risk | Cage nuts can fall off |