When hoisting a load with sharp edges, you should use ______.

When hoisting a load with sharp edges, using a softener is crucial to protect both the load and the lifting equipment. A softener typically acts as a protective barrier or cushion between the load and the lifting apparatus. This helps prevent damage from sharp edges that could wear or cut through slings, cables, or ropes, ensuring a safer lifting process.

In contexts where sharp edges are present, employing a softener mitigates the risk of slippage and failure, as it distributes the load more evenly and reduces stress points. This is particularly important in maintaining the integrity of the lifting system, as failure during a lift due to equipment wear or damage could lead to serious accidents or injuries.

In contrast, a shackle, while useful in attaching loads to lifting devices, would not specifically address the issue of sharp edges. Similarly, block and tackle systems are designed for mechanical advantage in lifting but do not provide protective features for sharp edges. Rounding sharp edges with a grinder is not practical for all scenarios and could potentially modify the load in undesirable ways. Therefore, the use of a softener is the most effective and applicable solution in this situation.