Product Description Spring wing toggle bolt. Slotted round head screw. Base material: drywall, hollow block, plaster, tile. 1/8 x 3" Head style: round head Drill size: 7/16" Wall thickness: 3/8 to 1-1/4" Base material: drywall, hollow block, plaster, tile Holds Up to (1/2" Drywall): 50 lbs Holds Up to (C-90 Block): 45 lbs Spring wing toggle bolt Slotted round head screw Steel/Zinc finish 50 per pack. 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.