Featuring the Extreme Bold snap line, the extra heavy-duty chalk box holds twice the amount of chalk compared to the Extra Bold snap line. It is ideal for field jobs where continuous snapping is required.

• Premium braided snap line creates Extreme Bold 0.07 in ( 1.8 mm ) lines.
• Holds 2x more chalk than the Extra Bold Snap Line marking tools.
• Heavy-duty aluminum case integrated with non-slip grip surface.
• Large refill port also allows for convenient felt replacement.