The Pica 591/46 Black Marking Crayon is a jobsite marking crayon for carpentry and industrial layout work. This is a marking crayon designed for marking out on rough construction materials. Model Number: 591/46. If you need a dark, broad mark that shows up on common building materials, this is the kind of simple tool that earns its keep fast.

Where this crayon makes sense is on surfaces that are not friendly to standard pencils or fine-tip markers. Source data supports use on wood, metal, stone, concrete, and plastic, so it fits general layout work across framing, masonry, shop work, and basic fabrication. It is also suitable for dry and wet surfaces, which matters when material is stored outside, brought in from a damp truck bed, or handled on a messy site.

The 11 mm diameter gives you a bold, visible line instead of a faint scratch mark. That is useful when you are laying out cut lines on rough lumber, reference marks on block, or quick positioning marks that need to stay readable without babying the tool. The 110 mm length gives you enough body to grip directly, while the hexagonal shape helps with control and keeps it from rolling away when you set it down.

Pica also built this crayon around system use. The Pica 591/46 Black Marking Crayon is specifically designed for the Pica Classic 588 holder, which is the important compatibility point here. If you already use that holder, this is the correct style of refill to keep your marking setup consistent. If you do not own the holder, that is worth knowing before you order.

Material quality matters more than people think with layout tools, because a brittle crayon wastes time and breaks when it gets bounced around with the rest of your gear. Supplementary source data describes these crayons as extruded and compacted for high breaking resistance. In plain terms, that means they are built to hold up better than cheap marking sticks that split too easily under normal jobsite use.

Another practical detail is cleanup. Source data indicates marks can be removed with a damp cloth when needed. That makes this a good fit for temporary layout marks, staging marks, or any job where you want visibility during the work but do not necessarily want the mark staying there permanently after installation or finish work moves forward.

This black marking crayon is best suited for carpenters, masons, general contractors, remodelers, and tradespeople who need broad, fast layout marks on rough materials. It is also a solid pick for serious DIY users doing framing, block work, shop projects, or general construction tasks where a standard pencil is not enough. If your work is cleaner, finer, and more finish-oriented, you may want a finer marking tool. If your work is rough, dusty, or outdoors, this type of crayon makes a lot more sense.

Simple, jobsite-proof marking

The Pica 591/46 Black Marking Crayon is a straightforward layout tool for rough materials, and that is exactly why it works.

• Who it's for: Contractors, carpenters, masons, and remodelers who need bold marks on wood, concrete, stone, metal, or plastic.
• Why it stands out: The 11 mm hex body gives you a visible mark, a solid grip, and direct compatibility with the Pica Classic 588 holder.
• Worth knowing: This is about durable, readable layout marking, not fine finish work. Also, holder compatibility matters here, so make sure your setup matches before you buy.

• What is this product used for? It is an industrial marking crayon used for marking out in carpentry and other jobsite applications.
• What materials can it mark? Source data lists wood, metal, stone, concrete, and plastic.
• Can it be used on damp material? Yes. Source data states it is suitable for both dry and wet surfaces.
• Does it work with a holder? Yes. It is designed for the Pica Classic 588 holder.
• Can the mark be removed? Source data indicates it can be removed with a damp cloth when needed.