These memory locks are a must for any rack with round tubing! Yes, they clearly make setup and teardown a whole lot easier... but more importantly, they keep the corresponding clamp from slipping and rotating around the bar! While these do require you to disassemble your current set-up and shimmy the locks down the bar for initial 'install', they are much more low-profile, lighter weight, and about half the price of their hinged counterparts. They work just as well, and I personally think they look better. Memory locks are technically not "necessary" to make your rack usable (and paying even more to add to an already expensive rack system isn't my idea of fun), but their importance and benefits cannot be understated. Make the investment and outfit each clamp with one of these... You'll be glad you did. While I used these memory locks for a Gibraltar rack system, they're compatible with most brands of clamps and work on any standard rack with 1.5" tubing.