#10 x 2-1/2" self-drilling Woodbinder screw for fastening steel roofing and siding panels through thicker insulation, double-batten, or reroof layers into wood framing below. The Micro-Bit drill point cuts through panel metal without punching, and the fine-to-coarse thread transition pulls the head down for a flush, weathertight seat against a vulcanized EPDM-on-steel washer that seals reliably even when driven at an angle.

• Hex washer head, #10 gauge x 2-1/2" length, 1/4" drive socket
• Self-drilling Micro-Bit point eliminates need to pre-punch metal
• Fine-to-coarse thread transition for superior holding in pine, fir, and SPF framing
• UV-resistant EPDM rubber vulcanized to G-90 steel-backed sealing washer
• V-neck head design resists twist-off under driver torque
• 2.5 mil powder coat over zinc-plated and chromate-sealed carbon steel
• 250 screws per pack

Best for: reroof jobs over existing shingles, metal-over-metal recover work, or new roofs running through a layer of rigid insulation board where the extra 1" of length is needed to reach the original rafter or purlin.

Tip: When running through compressible insulation, back off the driver as soon as the washer kisses the panel; over-driving compresses the foam beneath the panel and lets the EPDM start "floating" off the metal, breaking the seal.