In pinewood derby racing, winners are often separated by fractions of an inch. Although many factors affect each cars performance, precision alignment is key to reaching the winners circle. Unfortunately, inserting axles into axle slots is not easy. The axles dont want to insert straight, the wood can easily break, and setting the proper gap can be tricky. There must be a better way. And there is! Introducing the Pro-Axle Guide, a precision machined device that will improve the speed of your pinewood derby car by ensuring accurate mounting of axles: Axle Insertion - Ensures accurate mounting of axles (in axle slots) to improve alignment. Accurate alignment is critical for top speed! Wheel-to-body Spacing - Establishes the correct gap between the wheel hub and car body. The proper gap minimizes car wander and reduces excess contact between the car body and the wheel hubs.and an added bonus: Reduced Risk of Block Damage - During the insertion process the Pro-Axle Guide provides support to the wood around the axle slot, minimizing the risk of damage. BSA Speed Axle Say "Goodbye" to burrs and crimp marks! These BSA Pinewood Derby Speed Axles are precision-made to replicate the official BSA nail, but without the burrs and crimp marks. Benefits Accurate, round shaft to improve performance, No burrs and crimp marks, eliminating tedious work Axle head is slightly and accurately beveled to minimize contact with the outside wheel hub Axle head is round and centered on the axle shaft Shaft has a shiny plated surface. You can use the axles as is, or polish them with the Maximum Velocity Axle Polishing Kit or with our Maximum Velocity Axle Polish.