Weighting only 0.1Kg, this COLBOR NQD1 NATO extension bar & rail mount adapter is for CL220 & CL330 series video lights grouping, achieving modular stacking of these video lights in the horizontal direction. Its' 3.58" NATO extension bar is equipped with four 3/8" screw holes and three 1/4 screw holes for secure attachment to photography products. All the COLBOR lights could attached the products via this bar, including tripods, stabilizers, and other photographic accessories with matching screw ports.