Abstract: A portable tool for fitting a channel-shaped sealing, trimming or guiding strip onto a mounting flange comprises a gear box having an input shaft rotated by suitable motor and which drives two rollers in contra-rotating directions about respective axes. When the motor is energized to contra-rotate the rollers, the tool is driven along the strip and the rollers force the sides of the channel of the strip into tight frictional contact with the flange. The axis of one of the rollers is fixed in relation to the tool body. The other roller is mounted on a sub-frame so that its axis can pivot about a pivot axis which intersects with the rotation axis of that roller. The tool also includes a third roller for engaging the outside of the inverted base of the channel.