The Dixie Industries Sixth Wheel Ratchet permits the operator to use an ergonomically-correct posture, utilizing body weight while reducing muscle exertion to reduce risk of injuries. The Sixth Wheel Security Pin and Cap are a self-locking security system that can only be removed by using heavy-duty shop equipment. Available in three sizes, with the 13" size being the most common. See diagram at left to understand how the length is measured on these units. You can also check out the PDF brochure or watch the YouTube video for additional information.