Contractor-grade chalk snap-line with 100 ft of premium-grade ultra thin 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. of chalk * Durable, heavy-gauge die-cast aluminum case with folding crank * Positive gear-lock line hold, automatically releases during rewind