IRWIN Tools STRAIT-LINE 66305SL Carpenter's Pencil, Medium Lead, Box of 72 (66305SL) Broad lead makes fine lines for detail drawings or coarse lines on rough surfaces such as concrete or stone for saw lines. Oval shape won't roll away. For carpenters, builders, tradesman, or anyone who needs a tough pencil that will mark a variety of surfaces. Includes 72 medium-lead pencils.