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