Fotga DP3000 M1 Mount Bracket Rail Block Rod Clamp for 15mm rod DSLR Rig Rail Follow Focus (DP3000 M1 Mount Clamp) This Newest FOTGA DP3000 Mount Bracket Rail Block Rod Clamp fit for rod support rail system There are 4 holes in the clamp, it is used to extend the application of rigs. such as handle grip, matte box, flash, LED Light Material: Made of aluminum, Anodized black Made by CNC machine,Rod distance: 60mm Fits diameter 15mm rods