Milwaukee Inkzall Black Chisel Point Marker Pen INKZALL™ markers are designed for use on a wide range of surfaces from concrete, metal and plastic to wood, plywood and OSB. They perform exceptionally well on wet, oily, dusty or rusty surfaces, as well as surfaces with debris on. If you’re marking PVC or metal, the ink’s quick drying time reduces the risk of smear marks too. Suitable for writing on rough surfaces. Marker will not dry out, even after 72 hours without the cap. Suitable for writing on concrete, wood, metal, OSB board, plastic, cardboard, glass or ceramics. Can be used on wet, oily, dusty, rusty or rough surfaces. Quick-drying ink reduces smudging on plastic or metal