Spyder 1/2-in Quick Change Hole Saw Arbors5 Times faster than traditional hole saw systems Drop out the core at the push of a button Application uses: wood, cement backer board, wall tile, concrete block, brick, plastic, MDF Universal arbor fits most hole saw brands Saves time, money, and eliminates the hassle of plug removal Enlarge holes that are too small Extend pilot drill length to cut at an angle Durable tungsten carbide tipped pilot bit Features Shank Size 1 2 in Shank Type Hex