1/4-14X3/4 Hex Washer - Unslotted - 7/16" A.F. - Self Drilling Screws - Steel - Zinc

Head Height: 1/4" Diameter: 0.172 - 0.190" (#3 Drill Point)
Head Height: 5/16" Diameter: 0.208 - 0.229" (#4 Drill Point)
Case Hardened to Rockwell C50-56
(Core Hardness: Rockwell C32-40)
Steel Zinc Plated