Spyder 1/2in Hex 10 Carbide Tipped Hole Saw  Hole Saw Arbor - For Masonry, Concrete Block, Brick, Ceramic Wall Tile, Cement Fiber Board.  Spyder Hole Saw Sizes 1-3/8in and above Use on Masonry, Concrete Block, Brick, Ceramic Wall Tile, Cement Fiber Board Made in the Netherlands Universal 18 UNF Thread Tooless ejection of the plug For use on rotary drills only. Do not opperate using the hammer function.