Snap on wheel clamp fitted in under 10 seconds. 10/10 for security in AutoExpress tests. Two strengthened steel arms reach around tyre, slot together, and are locked with Bulldog's plunge lock. To choose model measure tyre width and distance "H" : the distance between the tyre edge and the rim or hole in trim. High security, integrated drill and pick resistant lock. NOTE: Please call the Customer Support Number above if you are unsure of which model fits your wheel.Product is Sold Secure Approved when used with the Wheel Lock Bolts below.