Pedro's L Hex Wrench Set 9-Piece Metric Hex Wrench Set With Holder. The hex wrench is the most common tool needed for the modern bicycle. Choosing the right set can make the difference between good day and a bad day working on bikes. Pedro's L Hex Wrench Set is up to the challenge. Pedro's made these wrenches from heat-treated steel to ensure superior strength and lasting performance. Pedro's hex wrenches also feature extra length and a round-style end for better leverage and easy access and handling of hard-to-reach bolts. Backed by Pedro's lifetime warranty.