A professional& contractor gradechalk line made by Tajima. It has a smooth winding 5-gear chalk snap line with a gasket sealed die-cast aluminum durable case. The line measures at 3/64" (1.0 mm) thickness.Creates bold, precise, & easy-to-followmarking lines for layout work. The metal hook end iselastomer-wrapped & has aneyelet to attach to a nail or stud. Ideal for wood, concrete, drywall, & more. 100' (30m) long premium braided line.