Self-Leveling Spike Roller 18" with the frame to roll out air bubbles in self-leveling cement mix after applied to the floor. Spiked rollers are the only way of remove air bubbles from self-leveling cement mixture. 18" Self-Leveling Spike Roller supplied with heavy duty frame. Self-Leveling Spike Roller frame fits all extension poles. 18" Self-Leveling Spike Roller measures 18" wide.