One Rail has a screw Knob Width Adjustment. 2nd Rail is a Lever Clamp w Lock ^^ Use included Metric 6 flat head screw to mount onto a ballhead.
^^ Jaw Length: 50mm ^^
Thickness: 15mm ^^
Net Weight: 99g ^^ 3/8" Standard thread will fit on any standard tripod or head ^^ 1/4" steel bushing adapter (included) converts it to 1/4" thread. ^^ CNC'd from Aircraft Grade Aluminum ^^ Includes bubble level