Center drill for HM hole saws 16-30 for hole saws up to 30 mm 32-330 for hole saws up to 330 mm XL drill/extender extra long drill 250 mm The center drill is also available as a masonry drill when you are going to drill in stone material up to hardness 6 = Leca, tile, lightweight concrete, brick. If you are going to make holes in harder materials such as clinker, marble, ceramic granite, granite and other materials above hardness 6, you should use Pro-Fit Diamond Hole Saws that you can use without cooling and directly in your drill driver. Some sizes are also available for angle grinders. You can also choose a center drill with SDS attachment