Make fine adjustments and keep your bike wheels true with this useful wrench from Japan. Features 8 slots and 7 sizes in one handy bike tool. Just the right size to tuck into your underseat bike bag. Fits gauges: 9,10,11,12,13,14,15. Works on most, if not all, bicycle wheels, including kids bikes, cruisers, mountain bikes, road bikes. If you're into bike repair or just want to ride in top performance, you'll want one of these.