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: 60mm
Thickness: 15mm
Net Weight: 127g.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