Now you can port your intake or cylinder heads and polish any aluminum or cast iron finish to show car perfection with this 92-piece kit. The Port and Polish Kit includes 90 cartridge rolls in varying sizes and shapes of 120, 80, and 60-grit paper. The kit also includes 2 mandrels of 1/8'' x 3/4'' x 1/4'' and 1/8'' x 1'' x 1/4'' all packaged in a handy storage case. Designed for use with electric drill motors only.