Black & Decker's really useful Power File is a great power tool for taking care of all kinds of sanding jobs, especially where access is awkward and those difficult to reach areas.
Fitted with a 13mm wide belt and a 120mm long arm, this powerfile is particularly useful for sanding internal apertures and mortises.
It is also handy for removing rust spots and corrosion on metal surfaces.
The Black & Decker KA900E Power File is perfect for shaping, filing and sharpening too.
Sanding belts for the KA900E-GB Powerfile available here