Rock Clamp AttachmentsSometimes a Thumb is to rough on the material your trying to handle. Thats why the pros at Frato Products introduced the all new Rock Clamp. Our Rock Clamp is the perfect tool on site when the Job calls for precise placement and minimal damage to your material. This Clamp Attachment was designed to allow Landscape and Construction contractors to easily and effectively move objects such as, sand stone, curb, boulders, Logs and Clay or Plastic pipe.