Product details:

#410 Stainless steel unslotted indented hex head, self Drilling, passivated & waxed screw w/bondedNEO-EPDM washer. Self-drilling screw drills a hole and taps a thread in a single operation. The drilling point must fully penetrate all pieces of material being fastened before the first thread engages. The washer and hex head are formed together as one piece. When the screw is properly installed, the bonded washer will create a leek proof seal.