Park's professional-quality, precision-sized spoke wrenches are hardened and chrome plated for long service. Wrenches are vinyl coated in one of four colors indicating the size at a glance. You will find these wrenches in virtually every professional bike shop and every shop mechanic's personal tool stash. Make sure you have the sizes you need in your home toolbox and bike bag. SW-0 is sized for 0.127" (3.23mm) nipples Fits common Edco®, Wheelsmith® and DT® square nipples, among others