1/8" Solid Carbide Zip Bit, For Irregular Cuts Such As Angles, Pipe Holes & Outlet Holes Through Ceramic Wall Tile, Cement Board, Cultured Marble & Plaster Up To 1" Thick, Cuts Throught Ceramic Wall Tile & The Attached Drywall Or Cement Backer Board With One Cut, For Use With RotoZip, RotoMite & SpiraCut Power Tools.