The STKR Concepts Mechanical Carpenter Pencil is a revolutionary Mechanical Carpenter Pencil that is quickly replacing the traditional Carpenter Pencil on the job site. There has been almost no innovation to the traditional Carpenter Pencil since the 17th century, despite the fact that Carpenter pencils are used by nearly all trades in the construction industry, including DIY, on a daily basis. If all your other tools evolved as slowly as your primary marking device, you would all Be pounding in nails with a rock. No more sharpeners, utility knives or broken pencils. The STKR Pencil allows carpenters to make crisp, sharp lines right out of the packaging. When more lead is needed, simply press the cap of the pencil to advance the lead. STKR knows that professionals on the job site Demand that their tools be designed and built extremely tough and rugged… The STKR Pencil is just that. The body of the pencil is thick-bodied, high-impact ABS plastic. The STKR Pencil is Designed with as few parts as necessary in order to eliminate jamming due to saw dust, dirt and grime. The STKR Pencil is loaded with Dura lead. Dura lead is 18% thicker than traditional lead and lasts 2-3x longer. It has a series of patented grooves which create a positive lock with the jaws of the stkr Pencil. This ensures that the lead will not slip into the pencil. Additionally, Dura lead is a resilient mixture of clay and Graphite, not harmful lead.