PETZL LIM'ICE Screw Sharpener SHARPEN: Easy handling of the device makes for quick and easy sharpening. HOW-TO: Two sharpening guides allow precise sharpening of both sides of the drill teeth. VARIETY: Standard sharpening guides allow sharpening of most ice screws. LONG LIFE: High-quality file is reversible for extended life. MATERIAL: Made from polypropylene with hemp and a steel file.