Here's a marking pencil that never needs sharpening. Its blade-like, carbon-fiber reinforced lead is fracture resistant and marks a consistent 1mm thick line at about the darkness of a standard HB pencil. The housing has the familiar cross section of a carpenter's pencil, but with the adjustment mechanism of a utility knife. An excellent pencil for drywall and dressed lumber.
One pencil blade is included with the SharpDraw; replacement blades are available separately.