Avanti Pro, 4 piece glass and tile drill bit set Set consists of 1 each 18, 316, 14 and 516 glass and tile drill bits Avanti Pro glass and tile drill bits provide top quality performance when drilling into glass and tile 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 to drill more holes The 3flat shank delivers added stability Avanti Pro glass and tile drill bits are only for use with drills in rotary mode