This adjustable tool is designed for use with a hand drill to accurately create new axle holes and a lower center of gravity for your BSA® and Pinewood Derby® car kits. The tool increases the accuracy of the body block by locking all four axle points together in one setting. Jig is designed to help the builder minimize ground clearance and gain lower weight placement (NOT recommended for use with slots). Features offset drill-guide holes for a raised-hole option of Rail Rider© alignment. Required #44 drill bit is included.