Hillman 370066 Round Head Spring Wing Toggle Bolt, 1/4 x 3", 50-PackToggle bolts are anchors for use in hollow wall or hollow block. The wing spreads the force over a larger load bearing surface. Toggle bolts are single use anchors. Size: 1 4 x 3" Head Style: Round Head Drill Size: 3 4" Wall Thickness: 3 8 to 2 1 4" Base Material: Drywall, hollow block, plaster, tile. Holds Up to (1 2" Drywall): 90 Lbs Holds Up to (C 90 Block): 85 Lbs Standard duty Spring wing toggle bolt 50 per pack.