T. ROCK 9 LED Theft Proof Bicycle Headlight and Taillight Combination (Nickel / Stainless) ***Sold as a kit. TO BE INSTALLED BY QUALIFIED MECHANICS ONLY*** Light weight design in T. ROCK is ideal for both commuters and enthusiasts. Never have your lights stolen with T. ROCK. Requires a " inch wrench (or adjustable wrench) and standard pliers for installation. Universal design includes multiple clamps suitable for cycles with tubing from 1" up to 1 " in diameter.