The Roofing Superstore Economy natural slate is a great cost effective option. With very little visible pyrite, this natural slate has a consistent and even finish. Spanish Natural Slate Specification Slate Size: 500mm x 375mm Roof Pitch: 25° - 90° Grade: Standard Quality Quarry: Universal Please note, this slate has been graded as T2 on the thermal cycle test, making it liable to rusting and changing in appearance over time. The structural integrity of the slate, however, does not diminish. Delivery Notes - Our slates are typically delivered on a six-wheeled lorry (11m long & 2.4m wide) with a tail-lift facility to offload on solid, level ground with a pump truck.Non-compliance to delivery restrictions may result in additional delivery charges. Should you specifically require a crane or small vehicle offload, please notify us at the time of placing the order, as an additional charge may be incurred. Please allow 5% extra in the ordered quantity to cover acceptable breakage in transporting natural slate products