Serrated Hex Washer - Unslotted - Self Drilling Screws - Red Head

SELF DRILLING SCREWS WITH MACHINE SCREW THREADS
Red-painted Heads to ASME B18.6.3;
Screws hardened to SAE J78 specifications
Case Hardened to Rockwell C50-56 (Core Hardness: Rockwell C32-40)
Steel Zinc Plated