The rectangular cross section of a carpenter's pencil makes it ideal for marking lumber, metal, ceramic or concrete, as the lead forms a knifelike edge that resists fracturing.
This one uses a notched lead that won't slip in the toothed jaw. A push-button release opens the jaws, letting the lead slide forward or retract by simply tipping the pencil. The high-impact ABS body resists breakage when dropped or stepped on.
The pencil comes with three black leads, 4" long and 7/32" by 3/32" (5.5mm by 2.5mm) in cross section that are easily sharpened on sandpaper.
Black replacement leads are available separately.