On Stage EB9760 Exterior Speaker Mounting Bracket Fits on 1 3/8 inch stand and mounts to any speaker cabinet. Mounting bracket is constructed from heavy-duty plastic and comes with mounting hardware. Features Nylon tipped tightening screw for secure hold, 3/8 inch holes for flush mounting, and 3/8 x 1 1/2 inch slots for pre-drilled holes.