16 Newcastle Drainer Treaded BS8020 SHOCKSAFE. Often known as a 'grafter' in some trades. Designed for digging deep and narrow trenches, channels and post holes. Our entire BS8020:2011 insulated shovel range is treaded as standard. Integrated treads provide better grip, increased comfort and protection to the user's feet. Tested and made in conformance with BS8020:2011. Tools for live working.