3/16" x 4" long Groo-V Tip Granite, Marble and Porcelain Multi-Purpose Drill Bit - Pack of 25 Designed for Drilling Marble, Granite, Porcelain Tile, Hard Metal, Plastic, Wood, Masonry Point Diameter: 3/16 in (5 mm) Shank Diameter: 3/16 in (5 mm) Overall Length: 4 in (101.6 mm) Drilling Depth: 2-3/8 in (60.32 mm)