Say goodbye to Cage Nuts and start using the faster, easier way to mount your equipment in 19" racks. The revolutionary new RackstudsTM are a universal replacement for the common cage nut. If you use cage nuts to mount IT, Pro A/V, Security or Telecommunications equipment in 19" racks, you're going to love RackstudsTM. Suitable for most* 19" racks with square punched vertical rails, RackstudsTM go in from the front and provide you with a place to hang your equipment while spinning on the lock nut. This makes mounting even heavy equipment much easier; even if you're on your own. They are easier, faster and safer than cage nuts and very strong. *This sample pack contains both sizes; 4 x red studs suitable for rails up to 2.2mm//0.086" and 4 x blue studs suitable for rails between 2.2mm/0.086" and 2.7mm/0.106" like those found in Chatsworth, Great Lakes, Legrand and others.