It has become increasingly common for kitchen and bathroom tiles to be made of tougher materials, so Bosch have developed the new 10X range which is designed to outlast conventional tile drill bits, and enable you to get more holes drilled with each bit. These Bosch Professional HEX-9 drill bits have 1/4" hex shanks which means they will fit into a wide variety of drill chucks and bit holders; additionally, the hexagonal shape helps to ensure a firm, non-slip grip in the chuck. Specifications • Diameter: 3mm • Length: 90mm • Pack QTY: 1 Features & Benefits • Designed for longer lifetime when drilling kitchen and bathroom tiles • Ideal for porcelain and ceramic tiles • Hex shanks: suitable for 1/4" hex chucks as well as standard drill chucks • Hex shank prevents slipping in the chuck