Which type of drywall or hollow wall anchor typically has the largest diameter?

Toggle bolts are designed specifically for use in hollow walls, such as drywall, and are known for their ability to support heavier loads. They consist of a bolt and a pair of wings that open up once inserted into the wall cavity. When the wings are deployed, they create a larger bearing surface inside the wall compared to other types of anchors.

The diameter of the toggle bolt, particularly the wings, is larger than that of standard plastic anchors, self-drilling anchors, or metal anchors. This larger size helps distribute the load across a wider area of the wall, enhancing the overall strength and stability of the fastening. This makes toggle bolts especially useful for mounting heavier items, such as shelves or appliances, where a strong and reliable securement is necessary.

While plastic and self-drilling anchors are popular for lighter loads, their construction doesn't offer the same width and reinforcement that toggle bolts provide. Metal anchors can vary in size, but they are not typically designed to distribute weight through a mechanism like the toggle bolt. Thus, toggle bolts, with their larger diameter and innovative design, are the most capable option when it comes to anchoring in hollow walls effectively.