A blend of utility and precision, the Accutrax 9mm Snap-off Carpenter's Pencil is the ultimate job-site marking tool - it's a pencil, not a razor that has been designed to look and feel just like your carpenter's pencil. However, this pencil never needs to be sharpened and always leaves the same accurate line every time. Simply extend the carbon-fiber reinforced graphite Pencil Blade using the slider button to lengthen pencil's marking edge. You can break the pencil along a segment to create a fresh marking point. The Accutrax 9mm refills are designed to fit any standard 9mm utility knife.