Hex-head self-drilling screws Carbon steel (C1022 material) Alzinc 1000Hrs. Drill #3, 6mm drilling capacity with 19mm OD Aluminum washer bonded to 3mm EPDM. 5.5x25, 300,000 pcs 5.5x50, 250,000 pcs 5.5x80 200,000 pcs 5.5x135 100,000 pcs (high thread)