The opening of each slotted jack pad is 0.378", depth is 0.642", wide by 2.992" in length.
Red High Strength Slotted Magnetic Jack Pad Pinch Weld Frame Rail Adapter
Red High Strength Slotted Magnetic Jack Pad Pinch Weld Rail Adapter
High Strength Slotted Magnetic Jack Pad Pinch Weld Frame Rail Adapter Orange
