EZ Locks allow the quilter to lock your roller bars with a simple twist of the wrist. This helps keep your quilt in place for more precise quilting. All new Innova quilting machines come standard with EZ locks. If you already have a machine and would like to upgrade, then you will need to purchase a EZ Lock Upgrade Kit. This Kit includes long roller end plates, short roller end plates, gears, collars, and the necessary hardware to install the EZ Locks.