Primacoustic Corner Impaler for Mounting Material: 20 gauge galvanized steel Dimensions: 3" (76mm) x 5" (127mm); 45 angle for 90 corners. Attachment Points: 4 x (Use appropriate fastener for wall surface) Max Load Limit: 12 lbs. (5.4 kg.) Dependant on wall fastener Number per box: 8 pieces Order Number: F101-1001-00 The panel is held in place using a series of sharp protruding darts that penetrate the panel to secure it during installation Primacoustic Corner Impalers are designed to provide the installer with a simple, quick and effective method of mounting Broadway fiberglass acoustic panels into corners to create a bass trap The steel corner impalers feature a 45 angle design that positions a panel across a typical 90 corner without causing serious defacement of the wall surface The panel is held in place using a series of sharp protruding darts that penetrate the panel to secure it during installation