6" Wheel Clamp Extender Set for Hunter, John Bean & Hofmann Alignment Racks. STOP TURNING AWAY BUSINESS! There's NO need to spend thousands of dollars on new alignment heads or a new rack (or spend $1500 on competitors extender kits). This machined billet aluminum clamp extender set is a quick and easy way to update your current alignment rack so you can work on the new large rim sizes from 24"-30". These extenders adapt to most all Hunter self-centering wheel clamps. KIT INCLUDES: 16 pieces that will fit 4 wheel clamp/adapters.