Product Overview: Axle inserter guide, one-piece design with integrated axle guide and wheel spacer Compatible Model: Accurate alignment for Pinewood Derby car axles, this is your ticket to faster Pinewood Derby cars Product Function: Improve your track times and reduce friction with perfectly straight axles in seconds Scientific design: Concave axle rib guide for smooth axle insertion, Thumb support for easy handling and precise placement Easy to Use: Simply place the Axle Guide in the axle slot, start your axle, then press it in for quick and accurate insertion with ideal wheel spacing Axle Inserter Guide with Built-in Wheel Spacer, Fits Pinewood Derby Cars, Accurate Alignment for Pinewood Derby Car Axles, Improve Track Times & Reduce Friction w/ Perfectly Straight Axles in Seconds