Compatible with all Earthquake Sound 6.5 inch in-ceiling speakers and designed to expedite home audio installation time during new construction | Rough-in kits come with four dog-ear mounting wings and two mounting ring brackets that provide 360 degrees of positioning for versatility | 30.5” wingspan and constructed of thin perforated anti-rust aluminum that can be trimmed to stud length | RK-C6 v2 designates a template for drywall installers to easily cut around and provides secure speaker mounting | The inner mounting diameter of RK-C6 v2 is 210mm. You will need to check the mounting specifications of your speaker if not using Earthquake. Mounting diameter should be between 200mm-210mm in order to work with the RK-C6 v2