Irregular objects require stable lifting points and cribbing due to their surface area contact and center of gravity considerations.

• A. Surface
• B. Edge
• C. Weight
• D. Volume

Answer: (A)

When lifting irregular objects, how the load actually touches the lifting hardware and the ground matters a lot for stability. The key idea is to maximize and control the contact surface so the load isn’t perched on a tiny point or edge. If the object is uneven or has odd shapes, distributing the lift across larger contact surfaces reduces point pressure, helps keep the rigging aligned with the weight, and makes it harder for the load to shift as you lift.

Cribbing provides a stable, level cradle that fills gaps and compensates for irregularities in the object's underside or its footprint. This creates a solid base and predictable cooperation with the lifting points, which in turn keeps the center of gravity from moving unpredictably during the lift. Put simply, the surface area of contact dictates how evenly the load can be supported, and cribbing helps establish that stable contact and base.

Edge, weight, and volume influence lifting considerations in other ways, but they don’t capture why stable lifting points and cribbing are needed for irregular shapes. An edge creates risky, concentrated contact; weight and volume matter for rigging capacity and space, but the immediate reason for stable lift points and cribbing is to manage surface contact and CG stability.