The Red Dirt Derby RDD001 T-Tool pinewood derby weight placement tool makes drilling perfectly sized weight holes simple.The drilling tool is engineered to help you achieve the ideal balance and centre of gravity necessary for maximum speed without the need for a drill press or complicated measurements.The T-Tool attaches in seconds and can be secured with a standard clamp.It is designed for use with 1cm and 1cm drill bits to fit standard sized tungsten pinewood derby car weights.It is compatible with wooden car bodies up to 4.4cm wide.Red Dirt Derby products are expertly engineered for the Boy Scouts of America's Cub Scout Pinewood Derby race.