1/4-20 x 3-3/8" Hex Washer Head Grade 5 Structural Self Drilling Screw, #4 Self Drill Point, Grade 5 Steel, Made in USA

The 1/4-20 x 3-3/8 Hex Washer Head GR-5 self-drilling screws are made from alloy steel heat treated to Grade 5 specifications (RC 28-34), with a higher hardness on the drill point and lead threads, and coated with a corrosion resistant finish.