Hougen 17803 RotaLoc Plus Cutter Kit 9/16, 11/16, 13/16" 1-Inch D.O.C. (For HMD130 only);

RotaLoc PlusTM Annular Cutters are designed for the Hougen® HMD130 Low Profile Drill. They're made of M2 high speed steel and are designed for a full 1" D.O.C.

What is Stack Cut Geometry?
Most Annular cutters come with Standard Geometry. These cutters are designed to cut through one piece of steel. They offer the fastest, cleanest hole while producing a slug slug that looks like a 'Top Hat'.
When the job requires drilling two or more pieces of steel, cutters with Stack-Cut geometry must be used. The cutting teeth cut from the inside out, producing a round cylinder slug allowing you to drill trhough mulitple pieces of steel at once. Using a standard geometry cutter to drill multiple pieces, you will have to stop and remove the slug before continuing on or risk breaking your tool. RotaLoc PlusTM cutters come standard with stack-cut geometry. Most other styles of Hougen cutters are available with stack cut.