General purpose 4x4 in ceiling adapter compatible with all standard 1.5 in. NPT interfaces weighing up to 300 lbs.. Adapter mounts to any structural wood unistrut (accessory required) or structural concrete (accessory required).Features Attaches to solid structural ceiling or standard 1 5/8 in and 1 5/8 in unistrutSpecifications Weight capacity - 300 lbs. (136kg) 1.5 in. NPT thread compatible - Yes Mounting surface - structural wood unistrut (accessory required) or structural concrete (accessory required) Construction - high-grade cold rolled steel Product finish - scratch resistant epoxy powder coat Item Weight - 0.7 lbs. (0.3kg) Dimension - 4.5 L x 4.5 W x 1.2 H in. Color - Black - SKU: CMSN052