Dura Ink® 55 Marker, Black, 1 16 in to 3 16 in, Chisel ORS NASCO Economical solution for many specialized Economical solution for many specialized applications Controlled in production to secure full gauge Used to provide leverage on hand operated valve wheels Permits a smooth snap hammer action to make opening and closing stubborn valves easy The special shaped opening in the wrench reduces the chance of slippage when working in overhead or crowded positions Durable cap with pocket clip for convenient storage Fast drying Heavy duty plastic barrel features ergonomic design for extended use Ink formulated for industrial strength usage Versatile tapered chisel tip makes 1 16" and 3 16" marks