The BB-580W Round Flush Mount Back Box is a metal case that can be attached to TOA’s PC-580RU/RVU flush-mount ceiling speakers for flush-mounted applications.

Knockouts Four ‘2-way ‘ ½”-¾” knock-outs spaced evenly at 90 degrees around the body , 2” from back, Four mounting straps
Finish Galvanneal (satin-coat) steel construction, Unpainted Anti-resonance spray coating applied to the interior of the enclosure
Dimensions 10” inner-diameter at the base, 11-5/8” outer-diameter at the mounting flange, 4” deep