Unslotted Hex Washer w/Bond NEO EPDM 18-8Washer Self Drill Screw Full Thread 410 Stainless

Type BSD: The 18-8 stainless drill screw offers superior corrosion resistance while the 410 stainless screw will drill through harder material than the 18-8. The hardness of the material to be drilled should be a minimum of 10-20 Rockwell hardness points less than the screw’s hardness