Material：Steel
Finish: Pre-galvanized
Standard: UL 514A
Size: 4”×4”
Depth：1-1/2” or 1-7/8” or 2-1/8”
KnockOuts. Size: 1/2” or 3/4” or 1/2”&3/4”
Thickness：0.7mm - 1.6mm