IRWIN Tools STRAIT-LINE SPEEDLINE PRO Chalk Reel, 100-foot (2031318DS) 3.5:1 gear ratio retrieves chalk line 3 1/2 times faster than standard reels. Crank-handle clutch release releases line without spinning handle. Braided nylon/polyester line is twice as strong as traditional chalk reel line and delivers multiple snaps of 1 mm (0.40-inch) thickness. Lightweight, durable, impact-resistant ABS case. Retractable self-locking metal handle allows reel to be used as a plumb bob. Hook storage and door locking mechanism virtually eliminate spills and line tangles. Refillable case holds 2 ounces of chalk.