Overview The Pro-Body Jig is an adjustable tool designed to accurately create new axle holes and a lower center of gravity by using a hand drill on BSA and Pine-Car kits derby kits. The required #44 drill bit is included. This tool is not recommended for use with slots. The Pro Body jig increases the accuracy of the body block by locking all 4 axle points together in 1 setting. The Pro Body Jig is fully adjustable for any wheel from the B.S.A. standard to a fully extended wheel base for maximum performance. The Pro Body Jig is designed to help the builder minimize ground clearance and gain lower weight placement (will not work with slots). The Pro body Jig has off set drill guide holes for a raised hole option.