PETZL - Laser, Ice Screw DESIGN: Better handling and screwing speed due to the ergonomics of the aluminum hanger. MATERIAL: The LASER is made of a steel tube and drill, and aluminum hanger. DURABLE: Stronger and more durable due to the steel tube and its specific threading. OPTIMIZED: Steel is treated to reduce weight and increase strength. VARIETY: The LASER comes in three lengths, 21 cm, 17 cm, and 13 cm.