Slotted round head screw. Steel/Zinc finish. Base material: drywall, hollow block, plaster, tile. 1/8 x 2" 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 Slotted ro