•  A precision-machined tool to accurately hold the wheel in the chuck of a drill. Benefits include:

•  Accurately machined shaft allows for precision use in any drill chuck or Dremel-type tool.

•  Step-down on shaft allows BSA® wheels to be mounted with the 'spokes' facing the drill chuck, simplifying work on the inside edge of the tread.

•  Knurled thumb screw eliminates the need to use a screwdriver to mount a wheel (a clumsy operation with the standard mandrel).

•  Beveled thumb screw ensures that the wheel mounts accurately on the mandrel.

•  Screw can be replaced should it be lost or bent.