Arca Conversion Kit for 717 E-image / Weifeng Video Head includes: Clamp Plate Bolt Level Converts your 717 head to fully Arca Compatible All Metal bolt and lever (to replace the plastic lever on the arm). Includes removable bubble level All Metal (aluminum) Construction No Rubber or Plastic Parts, except bubble level will accommodate most Arca style plate from various makers including: Sunwayfoto, Desmond, Arca Swiss, Kirk Enterprises, Markins, etc.