Diablo PMAGT1050-S4 Avanti Pro Glass And Tile Drill Bit Set, 4 PieceAvanti Pro glass and tile drill bits provide top quality performance when drilling into glass and tile. Avanti Pro glass and tile drill bits are only for use with drills in rotary mode. Highlights: 4 Piece Set consists of 1 each 1 8 inch, 3 16 inch, 1 4 inch and 5 16 inch glass and tile drill bits This range features a rapid start tip that delivers fast starts, with no walking. A carbide tipped cutting edge extends the life of the bit, allowing users