SILCA Ypsilon Travel KitTaking the humble Y wrench, and replacing the 6mm hex key with a magnetic inch bit collet, Silca has created an invaluable, versatile and beautifully engineered tool. The kit comes with hex bits, Torx bits and screw bits that slot securely into the collet so that the ergonomic Y wrench can be used for almost every job on a bike. The remaining two arms are permanent home to a 4mm and 5mm hex keys, so the most commonly needed sizes are always to hand.