A box of 200 high-performance 5.0 x 100mm woodscrews is an extra-long, heavy-duty structural timber fastener designed for high-penetration wood-to-wood fixings. Featuring a double-countersunk head with self-countersinking ribs, partial coarse threading, and a sharp split-resistant point, it drives smoothly into softwoods without requiring pre-drilling. Treated with a protective low-friction coating to reduce driving torque, the 100mm length and robust 5.0mm shank gauge deliver exceptional clamping force, shear resistance, and structural holding power—making it ideal for joining heavy timber framing, securing thick posts, anchoring joists, and deep structural construction fixings.