• Minimum Headlap – 75mm • Maximum Gauge – 345mm • Minimum Pitch – 22.5° (75mm Headlap) 17.5° (100mm Headlap) • Cover Width – 305mm • Nail Size – 40mm x 3.35mm Slate Nails • Batten Size – 50 x 25mm for rafters not exceeding 600mm • Covering Capacity – 75mm headlap – 9.7 Tiles /m² (Tiles /m²) 100mm headlap – 10.5 Tiles /m²