Bulldog PowerLite Trenching Shovel 5TSPL. These Bulldog PowerLite Trenching Shovels are hard wearing, light and above all safe. For general trench digging, particularly good for narrow trenches when pipe and cable laying. Bend strength exceeds the BS3388 Standard. The Bulldog PowerLite Trenching Sovels have a solid fibreglass shaft, manufactured from continuous parallel fibres, is fire resistant, non water absorbent and has insulating properties.