The Stainless Steel Rough-In Plate Is Intended For Use With Direct-To-Ceiling (Dtc) 3 Inch Slim, Mini Recessed, And Mini Gimbal Downlight Fixtures. This Stainless Plate Serves As A Guide To Best Align Dtc Downlights In New Construction. The Plate Comes Equipped With Knockouts To Accommodate Each Compatible Fixture Size, And Offers A Desired Length To Help Plan Fixture Spacing Between Joists.