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Luckyway 3 Piece Hole Saw Arbor,Mandrel Sets Package Included: 1 Piece 7/16 Inch Hole Saw Arbor with 1/4 Inch HSS(M2) Central Drill 1 Piece 3/8 Inch Hole Saw Arbor with 1/4 Inch HSS(M2) Central Drill 1 Piece 1/4 Inch HSS(M2) Central Drill Specification: Materials: 45 carbon steel for arbor,high speed steel(M2) for drill. Hex Shank diameter: 7/16 inch Drill bit size: Dia.:1/4 inch ;Materials: M2 high speed steel Applicable hole saw: 3/4 to 6 inches hole saw Using Tips:Pins lock the saw to prevent over-tightening and prevent Threads from Stripping.