Hexlox Key Code CThe worlds smartest and best looking anti theft system for bike parts Insert Hexlox into any hex head bolt you want to protect (key sold separately) A high strength magnet in base of Hexlox activates at the turn of the key Prevents thieves from using a hex wrench to steal your wheels, saddle, seatpost, stem, pedals and more Black color features durable diamond like carbon coating Also available: Hexlox non magnetic kit for aluminum, stainless steel,