Pentel s AM13 Heavy-Duty Mechanical Pencil marks on tiles, wood, drywalls, concrete and paper. It features a durable metal tip: a 4 mm sleeve stabilises the lead to prevent breakage. It s constructed with a sturdy metal clip that withstands repeated use. Also, its protective cap keeps the high-quality Pentel eraser clean. Ideal for use in woodworking shops, on construction sites, or other active working environments.