These high quality multi-use titanium drills have been designed to offer rapid drilling through a variety of materials such as plastics, wood, tiles, bricks, blocks, aluminium, laminates, glass, iron and copper. Not for use on porcelain. For a full list of the materials these drills cut please turn to the application guide on page 70. GT10580 Set comprises: 5.5mm, 6mm, 7mm, 8mm, 10mm & 12mm drills.