Feature: bimetallic materials for cutting steel, aluminum, brass, wood, plastic, wall lamps, gypsum and gypsum board. unique toothed structure for fast removal of cutting materials. lock the Hole Saw with a pin to prevent over tightening Material: M42 HSS, Bi-metal Package: 1 pack 6 inch hole saw 1 pack 7/16" hex shank arbor It is OK for drilling as clockwise rotation, but not anti-clockwise.
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