The SDS plus-9 hollow drill crown is ideal for cutting holes, especially for the installation of switch boxes. It is made of highly robust carbide with a fine grain, ensuring optimal wear resistance during drilling. Furthermore, the number of asymmetric carbide teeth on the drill is adjusted to its diameter, making it the right choice for drilling holes for switch box installations. The drill is designed for use in concrete, masonry, and aerated concrete. It is compatible with SDS plus or hex shank drills. Diameter mm: 68, drill crown depth (L1) mm: 54, working length (L2) mm: 72, number of cutting edges: 6.