Peerless-AV DCT900 Multi-Display I-Beam Clamp for 4-7" WideThe DCT7 heavy duty I beam ceiling plate has extended load capacities for supporting mulit display systems or larger heavier displays. Compatible with Peerless AV ADD extension columns for multi displays. Check your requirements before ordering to ensure compatibility. Not compatible with 1 1 2 11. 5 NPT extension columns or pipes Includes integral high density rubber decoupler assembly to prevent vibrations Unit has Peerless AV ADD extension column