C16 typically indicates a construction-grade softwood. "C16" refers to its strength grade, and "reg & trt" suggests it's regularized and treated. Description: Available Size: (47mm x 100mm) & (47mm x 150mm) & (47mm x 200mm) Grade: C16 (Common construction grade, suitable for various structural uses) Treatment: Regularized and Treated (Preserved against decay and insects) General Uses: Construction: Suitable for framing and structural elements in buildings. Outdoor Applications: Treated wood makes it suitable for outdoor use, like decking or fencing. Support Structures: Commonly used for joists, beams, and other load-bearing elements Quantity & Length: Minimum quantity is 4.8 metres in length. 1 unit = 4.8 metres. Always follow local building codes and regulations when using timber for construction.