3/4" Mallable Hook for High Bay Other Fixtures - High bay fixture hooks are used to hang light fixtures from multiple structural members .3/4" Mallable Fixture Hook features include: High bay fixture hooks are used to hang light fixtures from multiple structural members Pre-Installed set screw helps prevent vibratory loosening in High-Abuse areas 3/4” NPT Threads Malleable Iron Order Qty of 1 = 1 Piece Below is more info on our 3/4" Mallable Fixture Hook