SMALLRIG Coolblock 15mm Rail Block Rod Clamp Mount 90 Degree Angle for 15mm DSLR Rig System, Wingnut - 1104 For Vertical Installations: designed to work with standard 15mm rods and this rod clamp allows you to vertically mount two 15mm rods (90 degree) Spring Ratchet Wingnut: tighten the rod and re-position in narrow spots where youre not able to fully turn them Compatible with any standard 15mm rods, no risk of slipping out High Quality: made of Aluminum alloy, sturdy and durable. New CNC design, black anodized. Lightweight: weighs only 0.09lb, save your energy. Comes with 2pcs spring ratchet wingnut/knob