Dremel Mandrels in the Rotary Tool Attachments & Batteries department at Lowes.com
Dremel 1/2 In. Drum Sander Mandrel - Taylor's Do it Center
Amazon.com: Dremel SC407 EZ SpeedClic Sanding Bands and Mandrel, Set of 2 Sanding Bands 13 mm (Grit 60/120) and 1 EZ SpeedClic Mandrel for Sanding, Shaping and Smoothing Wood and Plastic Materials : Pet Supplies