100mm x 25mm (4" x 1") is a highly versatile size of treated timber, where durability is key but a smooth appearance and structural strength isn't necessary. Often used in garden project such as path edging and shed construction.
Comes pressure treated.
Available in 1.5m, 1.8m and 3m lengths.
Finish size is 98mm x 21mm.
Also available in 3.6m lengths on a separate page