Extra heavy-duty chalk box.

With an integrated handle release, premium braided nylon/polyester line and matching felt applicator, a wide fill neck, and an integrated case gasket / non-slip grip.

• Premium braided line creates an Extra Bold 0.04 in ( 1.0 mm ) line
  
• Heavy-duty aluminum case integrated with non-slip grip surface
  
• Large gasket-sealed refill port
  
• Double-speed winding mechanism