Swordfish 31510 Hex Washer Head Self-Drilling/Tapping Screw/Hex Washer Head Tek Screw Assortment, 200 Piece Hex washer head, self drilling Zinc plated carbon steel to resist rust and corrosion 8 Screw with hex head size of 1/4" 10 screw with hex head size of 5/16" Organized in a re-sealable PP storage case with chart inside box lid for easy selection