Contractor-grade chalk snap-lines with 100 Ft. (30m) of ultra thin premium-grade braided line. Smooth gear-drive winding, up to 3 times faster than standard snap-lines. Compact, fits comfortably in the palm of your hand yet holds up to 1.6 Oz. (45 gm) of chalk. Durable, heavy-gauge die-cast aluminum case sealed with an elastomer gasket. Positive gear-lock line hold, automatically releases during rewind. Also features a folding crank, easy-fill spout, and a tool to facilitate line replacement. Includes trial-size bottle of blue Micro Chalk. Blue case.