Use with ceiling grills and wall baffles to protect and enhance the performance of most 8" installed speakers. One piece CRS construction is undercoated and patch—jute lined, and finished in black epoxy. Each includes four 1/2"~3/4" knockouts, four "J" clips and one flexible perforated mounting strap. Conical shape allows easy transportation and storage of large quantities of units. Dimensions: 41/2" (H) x 93/4" (dia.). Outer flange diameter: 113/4". Mfr. #CS95-8.