5 Piece Spear Head Drill Bit Set with Carbide tipped heads for accurate drilling The Abracs SDBSET5 Tile and Glass Set consists of 5 Drill Bits in sizes ranging from 4mm - 8mm, all with 1/4 Inch Hex Shanks in a handy storage case. The Bits are manufactured with a Spear Head for precise, accurate drilling on first contact and a chisel edge that can be resharpened at any time. Fitted with a Quick-Chuck 1/4 Inch Hex Shank for fast, easy and safe bit changes and a carbide tip for precise non-slip drilling. Features: Carbide tips Precision drilling Long life Contains: 1 x 4mm  1 x 5mm 1 x 6mm 1 x 7mm 1 x 8mm