The perfect tool needed for every bench! The Surface Compactor tool is brilliant for compacting and smoothing metal surfaces after having added, or built-up excessive metal. Similar in operation to a margin roller, but more aggressive due to its “star” shape head. Ideal for smoothing of castings with porosity or defects. Has an overall length of 1.75”, head diameter 10 mm (.39") and thickness of the head is 2mm (.8"). It is on a 3/32” shank for use with a handpiece. Max RPM is 10,000. Made in Germany.