__________ are objects used to tighten cribbing sections where small crevices or gaps may occur before the load is applied.

Shims are thin, often wedge-shaped pieces of material that are used to fill small gaps or crevices and provide stability and support in various construction and engineering applications. In the context of vehicle rescue, shims help ensure that cribbing sections are securely and tightly fitted together before the load of the vehicle is applied. This is crucial for maintaining safety and stability during the rescue operations, as any movement in the cribbing can lead to an imbalance and potential hazards.

Using shims allows responders to achieve a snug fit even when surfaces are uneven, which is often the case when dealing with a vehicle that may have settled into a non-level position as a result of an accident. By addressing these small gaps before load application, shims contribute to a more secure setup for lifting or stabilizing the vehicle effectively.