This superfine sander with linear sanding motion (versus rotary or orbital) operates at 8,000 strokes per minute with a 3/32 in. (2.5 mm) stroke. It is ideal for surfaces, slots and tight corners. Included are four sanding attachments with straight shanks and 4 with angled shanks (four different shapes per shank style) as well as 3 sheets of pre-profiled adhesive sanding pads. The sheets are 180, 240 and 400-grit, with 5 of each shape per sheet. An AC adapter of at least 12-Volt - 18-Volt DC and 1 Amp is required (sold seperately). We recommend Proxxon power supplies NG 2/S or NG 5/E. The electronic speed control on the NG 5/E unit allows the selection of different speeds for different applications and materials.