I offer a line of art and workshop pencils. These pencils are available in two lead sizes - either 5.6 mm (almost 1/4-inch) diameter and 3 mm diameter. The lead is expressed by pushing the button on the end of the pencil, which allows the lead to 'free-fall' out of the pen.
I also offer a conversion for a popular mechanical drafting pencil. This pencil has leads in 0.3, 0.5, 0.7 and 0.9 mm and features an eraser under the chrome cap on the end of the pen and a spring steel clip that transfers easily to a custom turned pencil barrel in your choice of acrylic or figured wood.
Artist Sketch Pencil with an Acrylic Barrel
Mini-Sketch Pencil with a Dymondwood Barrel
Workshop Pencil with Jatoba Barrel