Lot of (300) indented hex washer head self-drilling screws with bonded EPDM neoprene washer.
These zinc plated fasteners are #10 thread and are 1-1/4" in length with a 5/16" hex and have a 5/8" diameter rubber/steel bonded and heat treated washer.
This screw has a #3 self-drilling point and measures 1-1/4" from the base of the drive head to the tip of the drill point.