Bose WMB2-MA12/MA12EX pitch lock upper bracketWMB2 MA12 MA12EX pitch lock upper bracket, Black Wall Bracket provides 0 10 of positive pitch retention for stacked MA12 and MA12EX arrays. Load rated for triple stacks. This bracket is used along with the WB MA12 MA12EX pitch only or WMB MA12 MA12EX bi pivot brackets. For indoor outdoor use. Features Placement Wall Product colour Black Tilt angle range 0 10 Tilt adjustment Yes