Smooth winding 5-gear chalk snap lines with gasket sealed die-cast aluminum cases and braided 1.0 mm extra bold lines. EXTRABOLD 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 lines 5gear, fast wind system allows for quick line retrieval of your marking string, saving you time on any busy construction jobsite PREMIUM ALUMINUM CASE Durable diecast 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