Sharp teeth in the base help prevent the frame from slipping. With the newer alloys on vehicles it is important not to clamp the frame because they will crush. The strap will allow the frame to slide as you straighten the vehicle. We recommend you use chain and chain binders to secure the vehicle. The item "Frame Machine, Universal Frame clamps, Full Frame, Chief, Kansas Jack" is in sale since Sunday, September 22, 2019.This item is in the category "eBay Motors\Automotive Tools & Supplies\Shop Equipment & Supplies\Auto Lifts & Frame Machines". The seller is "hookframe" and is located in Tucson, Arizona. This item can be shipped to United States.