Koolertron DSLR/VCR Shoulder Mount Rig + Follow Focus + Matte Box +15mm C-Shape Support Mount Bracket + Top Handle Grip With 1/4" Screws Can Be Installed OnThe Tripod For DSLR/DV Video Camera Make You Shoot Or Video Production Steady, Precise And Smooth 1/4" Screw Head Compatible With Most DSLR/VCR Matte Box Compatible With 15mm Rail Road Support System Material: Aluminum alloy Gears Nylon And ABS Dial Index Adjustment: 360