LENOX® Speed Slot® Hole Saw with T3 Technology, 6 in Dia Saw, 2L, 3L, 6L or 7L Arbor Hole, 1-1/2 in D Cutting, 65 rev/min Mild Steel, 30 rev/min Tool/Stainless Steel, 40 rev/min Cast Iron, 85 rev/min Brass, 90 rev/min Aluminum Speed, Bi-Metal Tooth, Applicable Materials: Mild Steel, Stainless Steel, Cast Iron, Brass, Aluminum