Get the job done with this 12 pack of Avery Marks A Lot UltraDuty markers with chisel tips and permanent black ink (29842). Built for situations where standard permanent markers just aren't enough, Avery Marks A Lot industrial markers are perfect for construction sites, warehouses, workshops and more. The bold fast-drying ink works great on plastic, wood, metal and concrete. The durable 5mm chisel tip also works on abrasive, dusty, wet and oily surfaces without clogging. The angled chisel tip also allows you to write lines in varying widths to switch from narrow to bold on the spot. Specially engineered to resist water, abrasion and smearing, the heavy duty ink makes sure that your writing will last through even the harshest of conditions. The cap also features a useful clip to help keep the markers secure in your pockets and to prevent the marker from rolling off of angled surfaces.