The FourJay CR8W Round baffle for 8" speaker has an outside diameter of 11". It has four mounting holes on 9-1/8" diameter circle, and four studs on 7-5/8" diameter circle to accept most background and foreground music speakers. The baffle is constructed of ceiling white, U.V. stabilized, high impact polystyrene thermoplastic (ceiling white, U.L. rated 94 V-O flame retardant, ABS thermoplastic) which is paintable. Furnished with four push-on nuts to securely fasten speaker to baffle, and four #8 x 1-1/2" truss-whitehead sheet metal screws to fasten baffle to mounting device.