The Hillman Group 372518 Mini Toggle Bolt, 3/8 X 4-Inch, 8-Pack Product Description Hillman Power Stud round head and spring wing. Medium-duty for hollow walls. Packaged in mini boxes. From the Manufacturer Toggle bolts come with spring-action wings and are intended for anchoring into hollow walls. The wing is designed to spread apart behind the base material upon installation for firm hold in hollow wall applications. The wing disperses the weight of the secured item over a larger area, increasing the weight that can be secured compared to a regular bolt. Features Hillman Power Stud round head and spring wing. Medium-duty for hollow walls. Packaged in mini boxes Brand name: Hillman Model number: 372518 Item Weight: 1.45 lb USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.