Malco GOS3EV 3-Inch Gutter Outlet Saw Ensure downspouts fit snug and flush with gutter and drop every time For use with a 1/2-inch, 13mm cordless or corded electric drill and a Malco Combination Arbor and High Speed Pilot Drill GOSA1EV High speed steel teeth set at 10 per-inch, per 25.4mm Will not grab or twist gutter material, even when cutting half round Service life of saws averages a minimum of 50 hole cuts in common gutter materials and capacities