Smooth winding 5-gear chalk snap lines with gasket sealed die-cast aluminum cases and braided 1.0 mm extra bold lines. EXTRA-BOLD SNAP LINE - 1.0 mm braided nylon line produces clean, clear, accurate snaps for the precise layout results. Designed to work best with Tajima Micro Chalk and Snap Line Dye FAST LINE RETRIEVAL - This Tajima chalk line's 5-gear, fast wind system allows for quick line retrieval of your marking string, saving you time on any busy construction jobsite PREMIUM ALUMINUM CASE - Durable die-cast aluminum body with elastomer gasket and metallic paint for easy chalk color identification POSITIVE GEAR LINE LOCK - Line lock holds layout sting tight while snapping layout markings and automatically releases when winding this chalk line tool EASY FILL NECK - Large chalk refill neck makes loading Tajima chalk line powder and Snap Line Dye quick, easy, and mess free, setting it above other construction tools