▼ Reinforced structural support at base and corners. Stronger, more durable! ▼ This large slotted jack pad is designed to fit the pinch weld width 0.39" on most vehicles' body, in order to jack up vehicles safely without any damage to the pinch weld or Rocker Panel. ▼ Each Jack Pad comes with 2 installed strong magnets in the slot for better holding strength while placing jack and lifting vehicle. ▼ Fit most vehicles with pinch weld at least 3" long. The slot opening of this jack pad is 0.39" width X 3" length. Slot depth 0.625". Base diameter 3". ▼ UPGRADES - (1) Better materials used: Anti-UV engineering Nylon PA6 + 30% Glass Fiber. Weather-resistant for outdoor use. (2) Equips with 2 strong magnets for easy deployment under chassis. (3) Modern design, must-have stuff in your tool box.